Fixed a lot bugs/security exploits

Profiles can't be hacked anymore, added some security control and
removed those malicious "hidden uid"
Errors now are now shown correctly while editing the profile
The level of the research you're doing in the Blacksmith/Armoury is now
displayed in the research queue
Hugely fixed the battle system, a big thanks to kirilloid for helping me
by providing his formulas :)!
Some general clean-up and bug fixing of little errors
Added some string constants to the language file (en.php)

GameEngine/Automation.php

@@ -1575,7 +1575,7 @@ class Automation {
                     $def_tribe = $targettribe;
                     $residence = 0;
                     $attpop = 0;
-                    $defpop = 100;
+                    $defpop = 500;
 
                     //type of attack
                     if($dataarray[$data_num]['attack_type'] == 1){