GMT GATK: with number of threads runs gatk command and stores exit code
InstData Gatk: retry realigner target creator if it fails for seg fault [exit 134]
GMT GATK: update number of threads test
Revert "GMT GATK: with number of threads runs gatk command and stores exit code"

This reverts commit c6fdc4792dec03413dd843bf92aec37f794410f3.

Conflicts:
	lib/perl/Genome/Model/Tools/Gatk/WithNumberOfThreads.t
GMT GATK: remove unless block around shellcmd in with numbers of threads
InstData GATK: capture exit code from realigner target creator