Reformatted all templates, externalised most javascript

Made minor changes and corrections in the markup, but most changes are whitespace.
Fixed bug in directory detail view
Mention dependencies in README
Added hints w.r.t. absolute SQLite paths to settings.sample.ini
Configured STATIC_ROOT

This is needed for `manage.py collectstatic`. Configuration is read
from settings.ini, with a relative `static` dir as fallback.
Fixed translation issue
Added login_required decorator to dajaxice functions and fixed ajax tests
Added superuser creation and password changing to README
Added clear filter button
Removed start_session and end_session and related functions