Code generalization re 32/64 bit flexibility.

[chipbarnaby]

Description

Various changes to generalize code to build OK in both 32 and 64 bit.

• Changed many LI (and ULI) to INT (UINT). INT is always 32 bit. LI is 32 or 64. For general working integers, 32 is sufficient. Some changed to size_t as appropriate (size_t is 32 or 64 bits). Some internal (non-cnrecs.def) code changed to built-in type int. File offsets changed to built-in type long to match library IO function arg types.
• Eliminated many INT etc. casts in printf-ish args. SIs are now implicitly promoted to 32 bits, cast is unnecessary.
• Changed some char * to const char *. More needed.
• Eliminated comments on some #includes that attempted to document why the include was needed. These comments are a maintenance hassle and thus generally unreliable. For example,

      #include "cnglob.h"  // LI

• Generalized expression code to be (more) aware of INTs. Added TYINT re internal data type tracking.
• Generalized cvpak.cpp conversion code re data type changes. Reworked limit checking code.
• Eliminated some C-style top-of-function declarations w/o initialization in favor of declaration-with-initialization within appropriate scope.
• Changed some integer types (e.g. SI) to bool in boolean contexts. Need to more fully support bool.
• Clarified use of "long" in comments -- stated actual bit size or built-in type as appropriate.
• Temporary regression testing framework for 64-bit build