CC-5015: Allow for cue_out points to be Null in DB

-prep for 2.4
CC-5016:
Allow user control for webstream metadata format

-fixed
CC-5016: Allow user control for webstream metadata format

-fixed
CC-5023:
Miss base_dir in GetServerType() will cause Web Server Type is "A"

-fixed
CC-5023: Miss base_dir in GetServerType() will cause Web Server Type is "A"

-fixed
2.3.1 release prep
Don't run the airtime-install script if Apache has not been configured [#CC-5020]
syntax error
Merge branch '2.3.x' of dev.sourcefabric.org:airtime into 2.3.x
add wait timer before liquidsoap is shutdown
Merge branch '2.3.x' into devel
Merge branch 'devel' of dev.sourcefabric.org:airtime into devel

Conflicts:
	debian/changelog