ModemManager location APIs

[Dan Williams <dcbw redhat com>]

Hi Pablo and others,

I pushed up a proposal for a location information API to MM git.  If you
have a bit of time would you mind taking a look at it?  Any suggestions
would be most welcome.  The bits about security do make things a bit
more complicated, but I decided to add them since at least many phone
manufacturers take pains to ensure that users can limit which
applications have access to location-based APIs.

Thoughts?

Dan