Squashed 'lib/perl/Genome/Model/Tools/Germline/gstat/' changes from 5482dd7..4d208d9

4d208d9 whitespace
bbf7ed4 solving mixed types of covar problem for binary trait in call.skat()

git-subtree-dir: lib/perl/Genome/Model/Tools/Germline/gstat
git-subtree-split: 4d208d908305f22bb1c0249e7074a9f87a30694a
Subtree merge of gstat repo from Qunyuan