Update motion templates to new template design. Added some missing model and view functions.
Update after comments: Removed user context var. Removed condition in unupport state check.
Merge remote branch 'upstream/master'

Conflicts:
	openslides/motion/models.py
Merge pull request #1 from ostcar/category

Category
Updated motion category template.
Merge pull request #2 from ostcar/category

Category Delete View
Added category_delete function to template.
Fixed version history.
New motion version diff view. Improved version history table in motion detail template.
Merge remote branch 'upstream/master' into motiontemplate

Conflicts:
	openslides/motion/models.py
	openslides/motion/views.py
Typo.
Changed style for empty category table.
Updated motion version warnings (not latest/authorized version)
Changed motion.number to motion.identifier.
Merge remote branch 'upstream/master' into motiontemplate
Moved htmldiff function to utils.py. Fixed travis build error (pep8).
GetVersionMixin not required. Fixed htmldiff function.
Improved version.get command
Reverted support/unsupport changes (question)
fixed pep8