Running from any directory

This update addresses several requests that PlasForest could not be run from any directory, due to the fact that paths for the .sav model and the plasmid database were hardcoded. This is no longer the case and the latest version of PlasForest can now be launched from any directory if the paths are precised in the arguments.

Update on database downloader

Solving the infinite loop issue

PlasForest v1.2

Update train_plasforest.py