Added rudimentary module documentation and made a couple of basic fixes

scripts/install_jos_specifications.py

@@ -1,3 +1,13 @@
+"""Parse source TEI specifications and save as a pickle.
+
+You can use this script to create a new pickle file to replace the one stored at
+../conversion_utils/resources/jos_specifications.pickle. The input file is expected to be a version
+of https://github.com/clarinsi/mte-msd/blob/master/xml/msd-sl.spc.xml.  However, the specifications
+are not expected to change, and if they do, the package pickle there should be updated upstream, so
+you probably should not have to use this script.
+"""
+
+
 import pickle
 import argparse
 from conversion_utils.jos_msds_and_properties import SpecificationsParser