Add Eigen function prototypes to diderot.h

Bug Fix: After the previous commit, the output was not correct for the OpenCL backend because it uses the shadow strand size rather than the original strand size. Fixed 

  Factored out common part of Diderot_World_t struct (see Diderot/world.h) and
  fixed output routines for the C and Parallel targets.

  Deal with the different sizes of status flags statically, instead of dynamically.

Update includes a working version of the OpenCL backend and output support. Upated the output function args to include a size_t output argument for the output data. 

Fixed the bug where the strand blocks were not copied from __local to __global data. All regression tests are passing except sum-ghp and vr-taxi

-This line, and those below, will be ignored--

M    pure-cfg/src/include/cl_kernels/kernels.cl
M    pure-cfg/src/include/Diderot/cl-scheduler.h
M    pure-cfg/src/lib/cl-target/main.c
M    pure-cfg/src/compiler/cl-target/cl-target.sml
M    pure-cfg/src/compiler/cl-target/runtime-names.sml

Fixed the compaction algorithm for phase 2 and create clEnqueueTasks for reseting the scheduler meta data between iterations. 
-This line, and those below, will be ignored--

M    pure-cfg/src/include/cl_kernels/kernels.cl
M    pure-cfg/src/include/Diderot/cl-scheduler.h
M    pure-cfg/src/lib/cl-target/main.c
M    pure-cfg/src/compiler/cl-target/cl-target.sml

  style fixes

Added some comments to the files 

Updating files with the new persistent scheduler 

  Split output code into two functions: one for nrrd files and one for text files.

Moved output proceedure to seperate file and updated c-target to use new output.

  Tweaking runtime system names

  Switch to using checked allocation function; added cuWidth info to OpenCL target.

  We don't seem to use the unshadow functions, so I've #ifdef'd them out and removed
  the name generation from runtime-names.sml

  Fix to how shadow types are handled

Added Support for converting host strands to its shadow types 

Fixed the remaining errors with the OpenCL scheduler code 

Compiler changes for output as a nrrd.

  Working on stabilize support

  Removed unnecessary clFinish calls and made printing more like C version.

  Added Unshadow functions for vector types

  Switch to using DIDEROT_CL_VERSION instead of __OPENCL_VERSION__.

  Changing test for OpenCL 1.0

  Fixed wrong function name

  minor tweaks to runtime

  Fix broken index.

Fixed the bug with converting global fields to its shadow global fields

  Added macro for accessing components of host-side OpenCL vector types.

Removed embedded pointers on both the host and gpu side

  Removed CL from compiler and Trace from LowIL and TreeIL (since it is expanded
  by mid-to-low).

  merging changes from trunk

  merging changes from trunk

  Add shadow types for marshalling data to the GPU

  Added functions to shadow vectors and matrices

  Added shadow types for shadowing globals that are to be copied to the client.

Added barrier synch to .cl file and fixed more address space bugs and upated the print function for OpenCL

  Fixing indentation etc.

Fixed more address space bugs in OpenCL

Fixed problems with OpenCL generation code to match with headers

  More header-file fixes

  Fixes to OpenCL header files

  Fixing OpenCL errors in header files

OpenCL runtime now compiling correctly and contains hookups

OpenCL runtime now compiling correctly and contains hookups

  Minor tweaks

  Added clamp and assignment operators.

  Working on OpenCL support

Editing CL header files

Add the OpenCL include file equivalents.

  Added name to world structure in OpenCL runtime.  Also added more error
  checking to Diderot_LoadSource.

  Add tensor subscript support to OpenCL

  OpenCL hacking

  Use the program name as the default output file name.

  Added timing support and fixed a build typo

  Working on OpenCL support

  Change filename and remove unnecessary definitions

Commiting OpenCL implementation does not include Diderot library functions support

  expand tabs to avoid editor differences

  Working on command-line option support

adding more comments, and cosmetic tweaks

working implementation of hest wrappers for command-line arguments

  Added options.h header file

  Split input functions into their own file and added Diderot_InputVec2

  Changed the naming convention for Input functions to precision independent

  Working on parallel runtime

  Use double precision to compute transforms for images.  We then convert these to the
  target precision.

  Added configure tests for various parallel runtime features.  Also, we now generate
  a config.h file, so autoheader is needed.

  Runtime system updates to support Die and to eliminate race for stabilizing

  Reworked representation of coordinate-space transforms in image objects

  Added partial support for mapping tensors from image space back to world space.
  Still need runtime system support for Hessians (see include/Diderot/inline-image.h)

some more 2x2 matrix math

  Added missing 2D and 4D vector operations

  Added 1D image operations

  Adding more 3x3 matrix support

  added functions to initialize a matrix to zero or the identity

  Adding 3x3 matrix multiplication operations

  Use matrix copy when assigning to matrix variables.

added minf as peer to maxf

  Added lerp functions

  Add normalize3f function

  Fixed typo

  Added missing sqrts

  Split matrix operations into their own file and added matrix (Frobenius) norm

  Added comments

added Diderot_ToImageSpace2f and tweaked Diderot_Inside2f, to get 2D convolution working

  Split up diderot header file into multiple files.

  Added fourth (zero) component to result of cross product.

missing a ; I think

  Added cross3f

  Added trace operator for 2x2, 3x3, and 4x4 matrices

  Added -m64 flag to C compiles and fixed some warnings.

  Added support for tracking output state variables through ILs and generating
  a print function in the C target.

  Switch to compiler-generated initially code.

  Added runtime interface to support creation of initial array/collection
  of strands

new implementation of inside

  Workaround for the fact that gcc does not handle vec2f_t correctly

  Add vector conversions and 2D vector support

  Fixing bugs in runtime code

  Working on vr-MIP example

  Streamlined code for real to int conversions

  Working on code generation

  Working on C target and code generation

  merged changes

  Fixing type errors

  Fix type errors

  Move diderot.h header to include/Diderot