* Add files via upload

RDConf: Low-energy ligand conformer search

* changes to rdconf tool:
* run black on the python script
* provide url to the original script and mention MIT licence
* add mmff, nomin and etdkg as parameters
* remove ref to non-existent macro
* other small fixes

* add rdconf test data

Co-authored-by: Simon Bray <sbray1371@gmail.com>