Major change to the implementation of spatial communication

Adding distance function and fixes to spatial communication

Fixed Spatial Communication bug

Global Reduction code fixes

Added Reduction to IL stages

Added Support for Spatial Grid structure for 2D & 3D

Added support for setting grid size

Added checks for making sure pos was defined

Added optimizations to foreach and dot notation

Fixed problem with foreach

added grid code and dot notation

Creating new developmented branch based on vis12

  working on inputs etc

  working on sequences, etc.

  adding missing support for dynamic sequence subscripting

  Working on inputs

  working on inputs

  Working on dynamic sequence loading

  Fix missing piece for c4hexic support

  Working on ":" support

  Added support for vec6 type and beginning of support for ":" operator.
  Also fixed some bugs.

  Add support for 3rd-order tensor norm and fix issues with tensor/vector multiply

  Added length function on dynamic sequences

  Changed "ln" function to "log"; added "acos", "asin", and "atan" functions; restructured
  the way that C math functions are handled in the compiler.

  port changes from trunk (addition of fmod, ln, and log10).

  Bug fix: the CFG was not getting constructed correctly in certain
  situations.

  More work on dynamic sequences.

  Working on support for dynamic sequences; also adding support for type coercions.

  Create a branch to implement things that we need for the Vis 2012 paper

  Merging in changes from pure-cfg branch.

  Merging in changes from pure-cfg branch: removed CL, expanded trace, and added method name
  datatype.

  Remove CL from compiler

  merging changes from pure-cfg

  Fixed bug in translating mehods with a conditional as their entire body
  (e.g., lic2.diderot example).

  Added support for hest-based command-line arguments to trunk.  Also switched
  output filename to prog.txt (from mip.txt)

  Added support for clamp to trunk

  Porting many changes from the pure-cfg branch, including value numbering
  and support for parallel execution on SMP systems.

  more merging of pure-cfg changes back into trunk

  Backporting changes from pure-cfg branch.  These include the "actor" ==> "strand"
  changes.

  Upated URL in header to diderot-language.cs.uchicago.edu

  Filter out dimensions of size one in tensor types

  Added more type info to HighIL operators to aid checking.

  Simplify basis by removing cruft that is not being used.

  Slice support in HighIL

  Working on slice support

  Fix inexhaustive matches by adding E_Slice placeholders

  Added types to IL variables

  Moving IL types out of the Op structures into their own per-IL structures.

  Moving high-IL stuff to its own directory

  Bug fix

  New version of IL with translation to HighIL and pretty printing.

  Working on lifting and translation

  Added type field to E_Input in Simple AST.

  Working on lifting

  Working on translation to HighIL

  Reorganize stuff to do with images, kernels, and fields into its own directory.

  Working on translateion

  Added Var substructure to SSAFn

  Working on translation to HighIL

  Working on translation to IL

  Working on translation to IL

  Minor work on translation

  Working on translation to HighIL

  Working on translation to IL

  Working on translation

  Working on translation to HighIL

  Working on translation to HighIL

  Switch the translate code to take simple AST as its input type

  Working on translation to HighIL

  Working on IR