Add sitevar 'swap/admission_control_debug' to turn debugging output on

and off.

sql/sitevars-create.sql

@@ -44,6 +44,7 @@ INSERT INTO sitevariables VALUES ('general/autoswap_mode',NULL,'0','Control whet
 INSERT INTO sitevariables VALUES ('webcam/anyone_can_view',NULL,'0','Turn webcam viewing on/off for mere users; default is off');
 INSERT INTO sitevariables VALUES ('webcam/admins_can_view',NULL,'1','Turn webcam viewing on/off for admin users; default is on');
 INSERT INTO sitevariables VALUES ('swap/use_admission_control',NULL,'1','Use admission control when swapping in experiments');
+INSERT INTO sitevariables VALUES ('swap/admission_control_debug',NULL,'0','Turn on/off admission control debugging (lots of output!)');
 INSERT INTO sitevariables VALUES ('robotlab/override',NULL,'','Turn the Robot Lab on/off (open/close). This is an override over other settings');
 INSERT INTO sitevariables VALUES ('robotlab/exclusive',NULL,'1','Only one experiment at a time; do not turn this off!');
 INSERT INTO sitevariables VALUES ('robotlab/opentime',NULL,'07:00','Time the Robot lab opens for use.');