A few fixes for issues found by spotbugs#1278

Merged

lbergelson merged 3 commits intosamtools:masterfrom tomwhite:spotbugs-more-fixes

Feb 27, 2019

+111-3

Commits on Feb 13, 2019

A few fixes for issues found by spotbugs
tomwhite
committed

Commits on Feb 18, 2019

Make hashCode consistent with equals and add tests.
tomwhite
committed

Commits on Feb 19, 2019

More fixes to hashCode
tomwhite
committed