Add media set improvements related to ownership transfers and deletion
ui: custom_urls: new: add one more hint about url format
entries_controller: fix listing of entries individual contexts, #cleanup hook
ui: entry: only link title of Context if it is 'individual'

or, said differently: if it is not in the main context group
Admin interface: default sorting on keyword list
admin can change type of a metakey from MetaDatumString to MetaDatumMetaTerms
Admin interface: handle keyword terms with no user and date of creation
deploy: production: check out git submodules (recursively)

immediate reason: make the api-browser work.
was tested&verified in staging in commit [7aa6d14be4ac68466109736b9ab0ff9faed86f53]
upgrade dependencies
upgrade app_admin js