Node to setup a PLANTS session directory

[sverhoeven]

(meta) node which writes config, ligands, protein, etc. to a directory.

The directory can be customized if required outside of KNIME.

The PLANTS docking can than be launched using a KNIME node (#3) or using the PLANTS command line executable.

[sverhoeven]

Implemented as metanode.

Port 0 should have a single row with the following columns:

• session_dir: Directory name of session as a string
• Molecule: Protein in mol2 format
  Port 1 should have following columns:
• Molecule: Ligand in mol2 format

After running the session directory will be filled with protein.mol2, ligands.mol2 and plants.config files.