[RFC - Python Scripting] Add 'end' attribute to gdb.Symtab_and_line

[Siva Chandra]

Siva> There is already an attribute 'pc' which
Siva> is described as "Indicates the current program counter address" in the
Siva> documentation.  I do not think this description is accurate: 'pc' is
Siva> actually the begin address of the program counter address range for
Siva> the current source line.

Tom> Would you mind fixing the documentation here?
Tom> (As a separate patch, not required for this one.)

Sure. Will send a separate patch.

Thanks,
Siva Chandra