Merge branch 'release/7.x-0.6' into develop
bugfix deprecated method: _bibdk_favourite_mask
serialize/unserialize session objects
empty clause on array and serialized favourites
bugfix:agency search-result is not an array
error on not acceptOrderFromUnknownUser
Formatting
Tagging version 7.x-0.7.
Merge branch 'release/7.x-0.7'