Tiny change, just for performance freaks
Just another little change (delta + 3 >= 0) goes to (delta >= -3) and commenting intervals
Shield usage rework, including:
 * Added magic skills (including debuffs, etc...) to shield mechanics. Shield def will be added to attacked mdef if shield defence succeed
 * Added system messages
 * For programmers: Formulas.calcShldUse now returns a byte. 0 = no defence, 1= succeed, 2 = perfect block
Fixing possible exploit.
Faror's 2nd part of fortresses implementation up to 18/09/08. All information on this thread: http://www.l2jserver.com/forum/thread.php?threadid=31217
Thank you Faror and all people that has worked on this patch
fixes #3399
Little fix for [2636] by Gigii-kun
Core support for 'Skill Mastery' related effects:
 * 2x time on effects (buffs and debuffs)
 * Chance to get no reuse delay (thx genya for visual fix on shortcuts)
 * Formula influenced by INT or STR depending on actor (mage or warrior)
 * For XML: stat code 'skillMastery'
 * Further information can be found along this thread: http://www.l2jserver.com/forum/thread.php?threadid=31594
Core support for Instance Dungeons. Thanks to all who helped test.
Update players speed on weight changes correctly. Thx pompinis.
Fixes #3400
TvTEvent.onKill() fix, thanks Migi-Chan and other coders/testers
Skill mastery doesn't affect to fishing skills, thanks _DS_ for reporting
Poison no longer resisted by MEN but by CON, thanks Melerix
Fixing skill mastery (I hope this is the last one).
 * If skill mastery succeed, reuseDelay = 100 ms (not relevant for gameplay).
 * Fixed system message
Thanks _DS_ for reporting
Fix of door status for TvT event
Fix for setting Wolf run speeds correctly. thx janiii.
Import cleanup
Small TvT exploit fix. Thx __DS__
Fixes #3407. thx melerix & janii