whether to add new restraints to existing restraints
Description:
This command reads restraints, excluded atom pairs, and
pseudo atom definitions from a file. An excluded atom pair specifies
two atoms that are not to be tested during generation of the dynamic
non-bonded pair list. There is one restraint entry per line. The two
possible formats of the file, MODELLER and USER, are
described in Section 2.5. The routine determines
automatically which format is used. The new restraints are
added to those that are already in memory if ADD_RESTRAINTS =
on, otherwise they initiate the restraints list. All the new
restraints are automatically selected.