Fix #850: always check access levels of logedin user
Fix #849: show attendances on open date events too
Fix #848: Remove CBE related things
Fix #838: adapt php extension check in installer, set release date to December
Fix #851: Check "Show attendee names to" setting on foreign CB profiles
Merge remote-tracking branch 'remotes/origin/development' into dev21

Conflicts:
	package/pkg_install.php
	site/models/myattendances.php