Gatk: rename the base class
GMT GATK: add mix in classes for threading options
GMT GATK: use threading mix in classes as appropriate
InstData GATK: use threading
InstData GATK: set max_memory for gatk tools using Genome::Sys
InstData GATK: do not compare grp output from base recalibrator test
InstData GATK: max memory returns GB
InstData Gatk: specify rusage for best practices commands
InstData Gatk: update threading in indel realigner
InstData Gatk: add -n to rusage in refine reads gatk base