Merge pull request #711 from dbetebenner/master

Merging up to 1.3-2.2 with numerous updates
Merge pull request #712 from dbetebenner/master

Adding some prettifying text to comments in testSGP(6)
Merge pull request #713 from dbetebenner/master

Bumping version to 1.3-2.3
Merge pull request #714 from dbetebenner/master

Adding Nebraska baseline matrices
make school number selection more selective for non-parallel processing
Merge pull request #715 from adamvi/master

Make school number loop more selective for non-parallel processing