The ProXL Error Handler

The ProXL error handler, if installed, will print a reasonably intelligent error message and then act according to the user-specified options. By default, it presents the following prompt and waits for user input:

     ProXL Error Handler (h for help)?

Th options available are:

     ProXL Error options:
      c continue - do nothing
      t trace    - debugger will start creeping
      d debug    - debugger will start leaping
      a abort    - cause Prolog abort
      e exit     - irreversible exit from Prolog
      A Abort    - cause Prolog abort and set this mode as the default
      h help     - print this message