Fix pgsql upgrade script (sorry, it was late on saturday).

Fixes #6193
Fix config parser with object custom variables.

Fixes #6330
Allow Classic UI config parser to ignore unknown objects.

Fixes #5826
Icinga should warn about deprecated configuration objects and attributes.

Fixes #6075
Update Changelog.

Refs #6075
Refs #6330
Refs #5826
Merge branch 'support/1.11' into next

Conflicts:
	Changelog