akohlmey/topotools: Release 1.7

TopoTools version 1.7 was released with VMD 1.9.3 and contains the following changes:

• better error handling in several places
• print out a reminder with DOIs for how to cite TopoTools and TopoGromacs when used for the first time
• auto-detection of atom styles for reading LAMMPS data files with style hints
• support for incompatible atoms styles dpd and hybrid is removed and support for sphere added
• bugfix for logic bug in detecting Nickel atoms from their mass
• add several missing sub-command references for sorting lists of angles, dihedrals and impropers