in the past all recordings have been loaded. At some point this has been
changed to load only active recordings. Now there are params supported
for both forms
all_recordings - all recordings for a broadcast
active_recording - add path of active recordings to broadcast
only_active_recording - show only broadcasts with active recordings
events sets a filter to included/excluded projects, studios and
locations. all-events.cgi does not set this filter and can be used to
query events from any project.
