Fix get_current_max_groups_per_user. Issue #6923
Fix SQL request (thanks Yannick)
Fix typo in commit
TO BE WATCHED: Optimize db to web transfer - limit query to one result in api_get_item_visibility()
Fix transparency for transparent PNGs when resizing - refs BT#7293

Conflicts:
	main/inc/lib/image.lib.php
Fix typo in WS call
Updating vendors
Adding php-ffmpeg
Removing old bootstrap  (v2) calls.
Adding  bootstrap in docs.
Update Nanogong to version with certificate - refs #6940