MolStar and derivative groups

**Is your feature request related to a problem? Please describe.**
It looks like the sulfates aren't bonded when you build this:
DGalpNAc[4S,6S]b1-OME
Default structure is fine, but the energy minimized one likely contains TER cards which MolStar is reasoning about. Perhaps we can force MolStar to draw bonds, or we load in a different file e.g. min-gas.mol2. Or this is something to fix at the MD_Utils (tleap doesn't add the TER cards) or gmml level (gmml doesn't add the TER cards)