Debug and pitest Maven config moved to lang after DirectBitSets
Replaced constant 0x3F with 63 in DirectBitSet implementations - simply more readable
JLANG-4 Added a bunch of methods to DirectBitSet interface, previously referred as setNFrom and setNTo
JLANG-4 Block find&flip ops in DirectBitSet shouldn't accept numberOfBits=0
Add unit tests for meta data.