A new empty group is created and an identifier to it is returned
in IGRP. The string supplied in TYPE is stored with the group,
and should be used to store a description of the contents of the
group (see also routines GRP_GTYPE and GRP_PTYPE).
The created group has the default control characters described in
routine GRP_SETCC, and has no "owner" group (see GRP_OWN).