[python] Allow explicit locations in breakpoints.

[Simon Marchi]

On 2017-12-07 10:12 AM, Phil Muldoon wrote:
> Apologies, my github branch was more behind master than I at first
> thought. I've attached the update patch.
> 
> Cheers,
> 
> Phil
> 

Hi Phil,

That version is fine with me.  As mentioned on IRC, it would be nice to
have a Python parameter equivalent to the -q/--qualified CLI switch.  I'd
be fine with it being done as another patch on top.

Simon