Add usewatunnels for eventual control of wide area tunnels.

Add logfile_open flag to be used with spewlogfile to determine when
a logfile is active.

sql/database-create.sql

@@ -174,11 +174,13 @@ CREATE TABLE experiments (
   testdb tinytext,
   path tinytext,
   logfile tinytext,
+  logfile_open tinyint(4) NOT NULL default '0',
   attempts smallint(5) unsigned NOT NULL default '0',
   canceled tinyint(4) NOT NULL default '0',
   batchstate varchar(12) default NULL,
   event_sched_pid int(11) default '0',
   uselatestwadata tinyint(4) NOT NULL default '0',
+  usewatunnels tinyint(4) NOT NULL default '1',
   wa_delay_solverweight float default '0',
   wa_bw_solverweight float default '0',
   wa_plr_solverweight float default '0',