Build solvent box and merge solute/solvent

Hi there,

This script is a different take on James Wescott's MergeSoluteSolvent script. In this script, a solvent box is created and then the solute and newly created solvent box are merged using James' script.

The solvent box creation can take some time and does not scale well with number of atoms so if you have Amorphous Cell, I would recommend you use that to create the solvent box and then use James' script.

Best regards,

Stephen