RdB's Geofield mods merged into fillerwriter's master branch

This code adds field/sort/filter for Proximity in Views and also ports the submodule Geofield Map.
Note that the code crashes in geofield_field_presave().
The original update and save operations present in the 7.x-2.x branch on drupal.org seem to have been ripped out, but not yet replaced. Same with the widgets of the 7.x-2.x branch on DO.
It appears that in the fillerwriter/geofield master we currently have a text area widget to enter a Geofield. And saving the Geofield causes a crash.