Merge branch 'master' into next

* master: (29 commits)
  BatchUplader: fix for permission checking
  inveniogc: guest users gc optimization
  inveniogc: clean up gc tasks
  BibSched: authorization typo fix in BibTasklet
  BibCatalog: ticket_submit() docstring update
  WebSearch: CERN-specific video latest additions
  WebSearch: CERN-specific lecture latest additions
  WebSearch: improve detection of record owners
  WebSearch: better retrieval of record tabs
  WebSearch: fix IndexError in is_hosted_collection
  WebSubmit: fix access restrictions in /uploadfile
  WebSubmit: allow record owners to upload files
  BibDocFile: escape file URLs in /files tab
  BibDocFile: fix type of bibrec-bibdoc connection
  BibDocFile: get_icon() for smallest size icon
  WebSubmit: allow image conversion of .tiff
  WebSubmit: grant access to the superadmin as owner
  BibFormat: add sponsor information to copyright
  WebSearch: CERN-specific hack for latest additions
  installation: lxml recommended
  ...

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>

Conflicts:
	INSTALL
	invenio/legacy/websession/inveniogc.py
	invenio/legacy/websubmit/functions/User_is_Record_Owner_or_Curator.py
	invenio/legacy/websubmit/webinterface.py
	invenio/modules/formatter/format_elements/bfe_copyright.py
	invenio/modules/knowledge/api.py