Revert to explicit invocation of the virtualenv python in write-htcondor-job-spec.py post-process script.
Revert to explicit invocation of the virtualenv python in write-htcondor-job-spec.py post-process script.

acorg/dark-matter,bamueh/dark-matter,acorg/dark-matter,bamueh/dark-matter,terrycojones/dark-matter,terrycojones/dark-matter