use four digit umask in wrapper.config

According to http://wrapper.tanukisoftware.com/doc/english/prop-umask.html the
umask is a four digit number.
Findbugs: A stab at squashing some issues across the board. Probably more to follow.
about 20 findbugs fixes all over
junit test for new DataHelper.skip()
moar test cases
xlattice findbugs
use DataHelper.skip() in a few more places
Findbugs: More findbugs fixes. Including but not limited to: null check fixes and some synchronization
merge of '3f85581f65aedde0f96729d197aaab223174f2e4'
     and '6df9f4e154d148867ee158cbe9e9acf3fb73d680'
partial revert of 6df9f4e154d148867ee158cbe9e9acf3fb73d680
merge of '3a7591d75dacb165b1b1d26c6bdd94184076fb03'
     and 'ba02b6daf2d660339ff05cfe0479344391e6e34f'