Version 6.0.3 released (07-May-2019)

This version (Git hash value 70ae1cee...) is mainly a maintenance release, serving to provide a few rather minor extensions. Among others, we added reduced density representations of wavefunctions for n_dim=6, and we changed qm_bound to avoid saving unnecessary, large matrices to data file.
Hence, this version can routinely solve time-dependent Schrödinger equations up to six dimensions and time-independent Schrödinger equations up to three dimensions on a standard office PC. Well, at least if not too large grids along each of the dimension are used.