changed dependency to python 2.6.9
Merge pull request #1219 from ostcar/python2.6.9

Changed dependency to python 2.6.9
Added extra permission check to speaker widget, fixed #1191 only for 1.5.x branch
Merge pull request #1216 from normanjaeckel/SpeakerWidgetPermission

Added extra permission check to speaker widget, fixed #1191 only for 1.5...
Fixed flake8 errors.
Merge pull request #1225 from normanjaeckel/Flake8Errors

Fixed flake8 errors.
Merge part of stable/1.5.x into master.

Conflicts:
	openslides/agenda/views.py
	openslides/mediafile/forms.py
	openslides/projector/api.py

The fix from commit 39de1924cb9dcfa93a5bdd95fa30c273f72fe420 was removed
because of the new widget system in master branch. See GitHub Issue #1191
Merge pull request #1241 from normanjaeckel/MergeStablePart1

Merge stable branch (part 1)