Fix initial run with postgres

Simplify error check, so that regardless of how the table name is
mangled, we now catch just the meaningful part.

When trying to obtain the lock, make sure that there is no transaction
block open (which tends to happen on error-paths); flush the database
connection before requesting exclusive lock.

pyfpdb/fpdb_db.py

@@ -589,11 +589,12 @@ class fpdb_db:
                 return(1)
         elif self.backend == self.PGSQL:
             try:
+                self.db.commit()
                 self.cursor.execute( "lock table Players in exclusive mode nowait" )
                 #print "... after lock table, status =", self.cursor.statusmessage
             except:
                 # relation "players" does not exist
-                if str(sys.exc_value).find('relation "Players" does not exist') >= 0:
+                if str(sys.exc_value).find('does not exist') >= 0:
                     return(2)
                 print "Error! failed to obtain global lock. Close all programs accessing " \
                       + "database (including fpdb) and try again (%s)." \