Heavily updated the Add/Edit page user interface. Some of the functionality has been refined. More refinement will come in the future. The main change is the UI. The page now uses a ListView to show each property rather than TextViews and buttons. This will be polished soon, but the basic functionality is still there, and it already looks much better than it did before even without the much-needed polishing. Removed GPS code since it didn't work properly (all it did was give latitude/longitude). Will add later if we want that functionality. Moved some other code around to different classes, etc. and some other minor changes.