fix for MOSYNC-3196

- changed the method documentation to make it clear
- implemented the requirement that empty cursors are like not having any
cursor
fixed some warnings in MoSyncDB.java

- replaced "new Integer(value)" with "Integer.valueOf(value)"
- same for Double and Long
warnings fix in Android

- deleted imported stuff that is not used
more warning fixes for Android
Merge pull request #444 from chovus/ThreeThree

sqlite fixes