[COOT] mutate rna

[jpd]

hi,
i am trying to mutate RNA. 
'Simple mutate' works but 'Mutate residue range' doesn't work.
It seems to think its a protein when i use that feature 
This is with coot-Linux-x86_64-ubuntu-10.04.2-gtk2/
Miramar (revision 3562)

thanks
jpd