Setting up some file level tests on the FAM file

The FAM file is probably the file in which human errors are most likely
to occur, so setting up some tests to see how the code handles
malformed or inconsistent FAM files.
Small fix to fam file so that son has a missing column
Clarifying running of tests
Merge branch 'develop' of https://github.com/tzhughes/genmod into tzhughes-develop
Merge branch 'tzhughes-develop' into develop