Prevent reading of atoms and bonds from MOL2 files

[anhi]

Reported by pthiel on 26 Jan 44023965 07:14 UTC The SDFile class of BALL provides a function disableAtoms() to prevent reading of the atom block. This is pretty useful for various purposes, e.g. to speed up counting of the number of molecules in a SDF. A similar functionality for MOL2 files would be very useful, too.