[pandora-dev] New pan.do/ra release (r6339)

[j at pad.ma]

|| pan.do/ra r6339

Time for a new pan.do/ra release. Renovations and maintenance:

- migration to Django 3.06
- requires Python 3.6 or later
- adding support for Python 3.8
- various bug fixes and cleanups

|| to pan.do/ra update run



 ./update.py

|| new features

- Documents section now has fulltext search support,
  requires elasticsearch and tesseract to be installed and a documentKey with "fulltext": true.
  With that, images get OCRed and PDF text is extracted (pdf ocr not yet available).


|| Upgrade to Ubuntu 20.04

This release adds support for Ubuntu 20.04, instructions on how to upgrade can be found at:
https://code.0x2620.org/0x2620/pandora/wiki/UpgradeTo20.04