[Gm2] Latest CVS changes

[Gaius Mulley]

Hi,

here is a summary of the latest CVS changes:

   * gm2/gm2-compiler/M2Quads.mod modified to accept zero length strings
     as compatible with type CHAR.
   * gm2/gm2-compiler/M2GenGCC.mod many modifications/refactoring to enable
     strings of 1 or 0 characters to be type compatible with CHAR.
   * these fixes allow Iztok's ISO library to compile cleanly.
        
   * gm2/gm2-compiler/M2GenGCC.mod fixed to allow HIGH(ch) where ch is
     of type CHAR.
   * gm2/gm2-compiler/M2GenGCC.mod fixed to allow comparison of literals
     against subrange types.
   * gm2/gm2-compiler/M2GenGCC.mod fixed to allow automatic conversion
     of strings of 1 or 0 characters to be passed to a parameter of
     type CHAR.
   * these fixes allow more of the third party tests (from Iztok)
     to pass.

enjoy,
Gaius