Fix flatpage creation without external url in adminsite
Fix path detail page where deleted objects were shown (fixes #1302)
Fix missing filters in trails list (fixes #1297)
Fix infrastructure main type filter (fixes #1096)
Rename event usage to type (ref #1289)
Add tourism permissions to Geotrek-rando
Merge branch '1297_trails_filters' into develop

Conflicts:
	docs/changelog.rst
Merge branch '1096_fix_infrastructure_filter' into develop

Conflicts:
	docs/changelog.rst
Merge branch 'fix_flatpage_edition' into develop

Conflicts:
	docs/changelog.rst
Merge branch '1302_fix_deleted_signages' into develop

Conflicts:
	docs/changelog.rst
PEP8
Fix tourism event type serializer
Fix position of POIs on trek detail maps (fixes #1209)
Fix TinyMCE not preserving colors (fixes #1170)
Raise validation error instead of crashing when submitted topology is empty (fixes #1272)
Fix mention of MAP_STYLES (ref #1226)
Fix event type migration
Renamed *usage* to *type* in touristic events (fixes #1289)