Fixes bug #1332.

Moved contacts/* to user/ and contacts/groups/* to group/, as groundwork for the new interaction api.

Lots of url/path moving, so there might be some brokenness for a while. Test cases certainly broken.

Renamed the 'view' parameter for view/view.php to be 'id'. 'view' will continue to work for a while.

view/blocks.php uses id, and id is used for other objects in the system, so it doesn't make much sense for this one to remain this way.

Renaming communities to groups step 1: everywhere in the code. Filenames and database changes to come.

its own templates columnleftstart and columnleftend.  this is a big
noisy commit

finished yet)