[Gm2] Latest cvs checkin's

[Gaius Mulley]

Hi,

I'm currently uploading some changes to gm2 in cvs which include:

  * bug fixes to the line numbering debugging info
    which is passed to gcc. Resulting in better Modula-2
    source file line number in gdb.
  * added the C `double' math built-ins
  * fixed path in Make-lang.in which caused `file not found
    error' during build
  * updated documentation to show correspondence between C and
    M2 data types.
  * fixed bug in M2SubExp.mod shown by indirect procedure calls
  * fixed bug in M2Constants.mod
  * introduced SHORTREAL data type and removed the pseudo module
    MATH as built-ins are handled via gcc backend.
  * removed corresponding gm2-compiler/M2Math module.
    Removed redundant gm2-compiler/M2Lexical module.

also included is a new example in `gm2/examples/svga' but it currently
fails to build (highlights a bug in gm2 which at a guess might be
caused by floating point code generation).

Gaius