[RFC][python] Fixes and improvements to gdb.Value.

[Tom Tromey]

>>>>> "Thiago" == Thiago Jung Bauermann <bauerman@br.ibm.com> writes:

Thiago> Ok, as we discussed on IRC, convert_value_from_python now throws a
Thiago> Python exception instead of a GDB exception.

Great, thanks.

Thiago> Also, I moved the boolean check fix to this patch, it was
Thiago> easier that way for me.

Also great :)

Thiago> The rest of the patch is unchanged. Ok?

The code bits are OK -- thanks very much.

Tom