Java7 invasion ! The summer is coming : cleanup on the code ? Tale of an Eclipse come back !

Under that title which worths best animes', come some cleanup and use of java7 features :
- Diamond for constructor invocations (+ activation of associated warning to be sure old system is correctly cleaned)
- try-with-resources block (also known as 'ARM block') ; drop of apache commonsIO jar, drop of L2DatabaseFactory.close(con).
- Fix all possibles methods when they can be static (+ activation of associated warning)
- Fix all QUESTS STATIC maps (almost all...) to be "private final static" and "HashMap" instead of "FastMap".