#1088: develop python-based entry metadata extraction

add:

• supplied titles
• categories
• filter out:
  • non-entry divs
  • continued divs

see: #731, #819

@matthewkumar, this has now become an automation task in python: - Entry metadata table https://github.com/cu-mkp/m-k-manuscript-data/blob/master/metadata/entry_metadata.tsv Python script to generate this table from ms-xml files