Added print-output option to model-group get-last-completed-builds
Added genome model-group unarchive

This is different from:

genome model build unarchive model_groups.id=<id>

because it only unarchives the 'last completed build' on each model.  It
will crash if any of the models in the model-group do not have a
'last completed build'.
Added err_file option to Genome::Sys->bsub

Previously only -o was being set with log_file, so
in order to get stderr as well I added this.
Fix bug in unarchive where lsf logs are missing

Removed the manual quoting since it is handled properly by IPC::Run and
with it the log files are never written.
Added err_file output when unarchiving builds