Fix totally broken value ranges of integer PDB parameters. Magically,
the bug was affecting only exactly the two cases mentioned in above
bug report.

* tools/pdbgen/pdb.pl (arg_parse): return <, <=, > and >= literally
  instead of applying a mapping that was originally meant for
  generated C code that would e.g. transform "0 <= int32 < 10" into
  "if (value < 0 || value >= 10) fail". This inversion of all
  operators is now wrong because PDB parameters have been turned into
  GParamSpecs which always need inclusive ranges as min and max
  values.

* tools/pdbgen/pdbgen.pl (arrayexpand): generated array length type
  specs must be "0 <= int32", not "0 < int32".

* tools/pdbgen/app.pl: when generating integer param specs, check if
  the value range is specified in terms of < instead of <=, and
  add/subtract 1, resuting in the inclusive range needed for integer
  GParamSpecs.

* app/pdb/color-cmds.c: regenerated, fixing the two broken ranges
  mentioned in the bug report.