less: use upstream's dataTables.bootstrap style instead of jquery.dataTables.css See https://datatables.net/examples/styling/bootstrap.html . - use official dataTables.bootstrap.css and dataTables.bootstrap.js - add datatable less style block to use kallithea font icons - move dataTables related style to this new block to have them in one place - remove style that is obsolete, overrides or gets overriden by dataTables.bootstrap.css

# requirements.txt file for use as "pip install -r requirements.txt" as a
# readthedocs compatible alternative to "pip install -e ." which is a working
# alternative to "setup.py develop" which doesn't work with Mercurial 3.7
.