[RFA] Version 2 of patch to add 'maint profile-gdb' command

[Andrew Cagney]

> maint <action> [<args>]
> set maint <control var> <value>
> show maint [<control var>]

just an aside to this, there is also

	set/show debug ....

but I don't think we need to change that to ``set/show maint debug 
...''.  ``set/show debug ...'' is very specific enable/disableing 
internal debug tracing.

enjoy,
Andrew