*some fixes

* fixed installing samples when for example Rook Sample already exist and other samples not
* fixed some mysql error when character you trying to create already exist
* fixed signature fonts finding path
* removed DEFAULT '' for TEXT field. It didn't worked under some systems like MAC OS X.
* moved news adding at installation from schema.sql to finish.php
* removed some unused cities field from myaac_spells table
* some optimizations

system/migrations/5.php

@@ -0,0 +1,4 @@
+<?php
+	if(fieldExist('cities', TABLE_PREFIX . 'spells'))
+		$db->query("ALTER TABLE `" . TABLE_PREFIX . "spells` DROP COLUMN cities;");
+?>