Test data from recent paired end HiSeq and associated test for xahuman
split with default parameters.
Add Truth table to unit test.
Test added for inverted file names;  INVERT_TARGET simple logic and
test.
Run test data through picard-tools-1.72/FixMateInformation after hand
editing: note that the * Y and Y * cases are changed to Y Y, but flags
remain correct for unaligned.  20 Y and Y 20 are not changed by
FixMateInformation.
Experiments with a different approach to INVERT_TARGET, tests passing.
Tests for EXCLUDE_UNALIGNED set to true for xahuman data (failing) and 
the reversed filenames for yhuman (failing) for historical reference.
Minimal change to existing logic for INVERT_TARGET
Use built-in XOR operator.
Make the default value of INVERT_TARGET to be false to protect future
uses.
Add failing test for xahuman with EXCLUDE_UNALIGNED set to true
Correct the first two truth tables in comments for the [Y|MT] 20 case:
functionality unchanged.
Correct MD5 values
Merge pull request #55 from KateTaylor/devel

SplitBamByChromosome new functionality for Y split