Bugs Fixed compared to gpc-20060215:

   * 20060304: Do not allow passing strings to parameters of type array
     of char subrange (avoids passing out of range values).

   * 20060228: Use at least integer precision for arithmetic (avoids
     loss of precision due to overflow)

   * 20060225: Avoid ICE on some record types

   * 20060225: Avoid segfault in bison parser