EXIF.py for exif diddling.
added ipython to localdev
base forms location munging from exif.
differentiate anon and non-anon forms
reorganise stuff out of core
some dumb get/post views for sighting submit
first hash at submit form - mobile map with drag/drop pin [#51186365, #51186501]
validation of tree, resetting fields/map after error, input pattern. [#51186365, #51186501]
tidy up in-page style. use real redirect on post success.
improve admin - add GIS widget, link to tree, ordering
add absolute url for Sighting - view page or map, for now.