Remove old compatibility code
Add an all-too-simple test for MoveNodeForm
Thoroughly test MPTTAdminForm validation
All supported versions of Django support multi-column ordering in changelists, take advantage of this

Fixes #332. Did I already mention I really like deleting code?
Update MPTT properties also when bulk deleting issues through the admin interface

Fixes #155.
Add a test for the ordering in changelists

Refs #332.
Prevent calling various get_* methods on unsaved instances

Refs #252.
Avoid deprecation warnings concerning django.db.models.loading and django.contrib.admin.util
Fix #269: Items should be indented using padding-right with RTL languages
cast primary-key value with field before sending to database.

Needed when UUID column type is used as primary key
Test UUID support
remove obsolete requirements.txt