- added Option "--comment" to be able to override the default compilation comment
- improved the abort subroutine to not rely on an external "tail" command (the
  default /usr/bin/tail on Solaris does not understand the "-n" notation).
  Get rid of a "useless use of cat" case in the process.


Build-tools/Do-compile:
  - added Option "--comment" to be able to override the default compilation comment
  - improved the abort subroutine to not rely on an external "tail" command (the
    default /usr/bin/tail on Solaris does not understand the "-n" notation).
    Get rid of a "useless use of cat" case in the process.