NAME
     MakeMolCyclic - make molecule ribbon display cyclic

SYNOPSIS
     MakeMolCyclic

DESCRIPTION
     Add a dummy residue 'XXX' with a dummy 'CA' atom
     as the first and last residue of all selected molecules.

     The resulting molecule structure can then be displayed cyclic
     using the AddRibbon command.

     If any selected molecules already have residue 'X' then
     an error is reported and the process halts.

EXAMPLE
     MakeMolCyclic

SEE ALSO
     AddRibbon, AddRes and RemoveRes

DATE
     20131030
