1. -ssaiv enables code to force WL index variables
   into SSA form. This definitely kills WLF today, 
   manifesting itself as references to undefined IVs.
   If you use it with -nowlf, you may get further.

2. -doswlf extended:
  - Operates on multiple WL partitions in both folder
    and foldee WLs.

  - Maps modarray(foldee) WLs into genarray(shape(foldee)),
    to eliminate reference to foldee data.

  - Slightly improved analysis of WL bounds. However,
    the whole array shapes and bounds
    thing remains a dog's breakfast. 

Operation to invoke extended WLF requires:

 -ssaiv -doswlf -dosaa

and may also require

 -nowlf

   but I want to get some stuff checked in. Theoretically, this is
   all enabled only with sac2c option -ssaiv. The intent is to make
   that option go away, and to make flattened code the standard for
   all code in the above phases.

2. -d treecheck code to detect non-flattened GENERATOR_BOUND1 and
   GENERATOR_BOUND2, which are the only ones I absolutely need to
   be flattened, at present.

and the associated ICMs renamed to fully qualified names:
dim_A, shape_A, sel_VxA, reshape_VxA, modarray_AxVxS.

However, internal_lib itself has not yet been removed from system.

new compiler module support/math_utils.

compiler module support/str.
Extended refactoring mechanism by additional condition.

This is necessary for the improved tree sanity checks
in traverse.c

added new attribute ARRAY_BASETYPE to capture the scalar type of the array's elements (as used in new_types.h). 
This is of special importance for the empty array [].
Two utility functions TCmakeVector and TCmakeIntVector were added to tree_compound for convenience.

Removed printing on OPT as the required output is generated automatically by PHrunCompilerOptimizationInCycle.

compiling

an exprs node as its second argument!

PHASE I

Usertype.