Micro coding-style fix
Set a nicer default zoom level

WARNING: This is nicer accoring to my screen display and only in
comparison to the default, i-e no zoom.
Take user to his/her location, if possible

We make use of new (not even in git master yet) geocode-glib API to
center and zoom the map to user's location.

Once we also get the accuracy info from geocode-glib, we can make a
better decision about how much to zoom.