breakpoint extension for remote protocol, take II

[Jim Blandy]

> I'd like to seriously propose that:
> 
> 	[qQ][A-Z].*
> 
> be reserved for GDB's internal use while:
> 
> 	[qQ][a-z].*
> 
> be declared as available for custom jobs.

I guess I don't understand the distinction between "GDB's internal
use" and "custom jobs."  The interpretation that comes to mind first
is work that will go into the standard GDB distribution vs. stuff that
won't.  That doesn't seem predictable.