* Attempt to check file writability and emit a warning on the status bar
          if nano doesn't think the file can be written to.  Feature originally
          requested by Damien Jolders <madamien@skullsquad.com> et al.



git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4407 35c25a1d-7b9e-4130-9fde-d3aeb78583b8