[Bashdb-pydb] Added Ability to change -W options in running programs

[R. B. <ro...@pa...>]

I made a small addition, I've meant to do. Basically I've added the
ability to change the python warning options, e.g. -Werror,
-We:Deprecation, etc.

The actual commands are "set warnoptions [opt..]" and "show
warnoptions". As is customary, "warnoptions" can be to the point of
making it unique across other commands. Currently this would is just
the letter "w". However should "show warranty" get added, it you'd
then have to use "warn" as the minimum abbreviation.