Events storage procedure

Added the necessary database code to convert the contents of event
queues into actual event records. The changes include:
 * a new table, events.pending_events, which is automatically filled by
a trigger when events are inserted into queue tables,
 * the game.events.batchSize constant which defines the maximal amount
of events to process in a single transaction,
 * the events.eq_process() stored procedure, which processes the events.
In addition, the "hstore" extension was added as it is the easiest way
to convert events from the queues' table model to the store's
meta-model.

legacyworlds-server-beans-system/src/main/java/com/deepclone/lw/beans/sys/ConstantsRegistrarBean.java

@@ -32,6 +32,8 @@ public class ConstantsRegistrarBean
 		// Misc. game-related values
 		cDesc = "Game updates - batch size.";
 		defs.add( new ConstantDefinition( "game.batchSize" , "Game (misc)" , cDesc , 20.0 , 1.0 , true ) );
+		cDesc = "Event processing - batch size.";
+		defs.add( new ConstantDefinition( "game.events.batchSize" , "Game (misc)" , cDesc , 100.0 , 1.0 , true ) );
 		cDesc = "Population growth factor.";
 		defs.add( new ConstantDefinition( "game.growthFactor" , "Game (misc)" , cDesc , 50.0 , 1.0 , true ) );
 		cDesc = "Increase to the population growth factor caused by reanimation centres.";