Rfplasmid

New release incorporating some fixes and additions:

1. Automated sampsize selection for training.
2. Renaming the taxa agnostic Bacteria model to "Generic"
3. TOC in the Readme
4. Google Colab notebook

- Checks for errors in dependencies (e.g. CheckM database)
- Fixes for model training
- Improved manual
- Checks for existing output folder

Finally, no more python2 checkm.

Improved manual and install

First release of the RFPlasmid tool