Okay that will not work. Revert forcing reset_multis on !viewok as it's too expensive

Okay that will not work.  Revert forcing reset_multis on !viewok as it's too expensive
for things like deleting text.  Will have to go back and force inside functions.
Add check in reset_multis for CNONE type since that's slowing us down and is dumb
to leave out.

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4379 35c25a1d-7b9e-4130-9fde-d3aeb78583b8