perl5db.pl patch against missing args destroying pre-post command setups

This is a patch to fix a couple of things in the debugger:

	1. losing multiple 'watched' elements because of scalar context

	2. the pre- and post- perl and debugger commands were all trashed when given no args

Point 2. now behaves like the a, b and w and removes the need for the 

	'a command without an argument should *never* be a destructive action' 

comment.  Though personally I think it would be good to leave the note in for future reference.  BTW: I think these are the last commands that still did this.

I placed the old behaviour in the pre590 command set for all you die-hards out there :-)

Richard Foley
Ciao - shorter than Aufwiedersehen

• perl5db.pl patch against missing args destroying pre-post command setups by Richard.Foley