Added status field on feedback reports (fixes #1075)
Added pictogram on difficulty, useful for *Geotrek-mobile* (fixes #1109)
SITRA support in Tourism datasources (fixes #1064)
Safety check if difficulty has no pictogram
Merge branch '1064_sitra_converter' into develop

Conflicts:
	CHANGES
	docs/advanced-configuration.rst
Merge branch '1075_add_feedback_status' into develop

Conflicts:
	CHANGES
Merge branch '1109_add_pictogram_difficulty' into develop