The BLAHP submit wrapper creates a temp directory and cd's there
before running the executable. This breaks Pegasus jobs for a
sharedfs site as it expects to be in the shared-scratch dir
via the `remote_iwd` Condor ClassAd.  This dir is available via
the PEGASUS_SCRATCH_DIR env variable in the job, so cd there as a
workaround.

Condor jobs do not see normal user shell init scripts.  Have to
explicitly dot it in for module to work.

Updated yaml_job validation.  Added workflow validation for modules, yaml_jobs, and run files.  Added wrapper scripts for some commands.