GitLab

        * src/*: Introduce (basic) vim-style file locks.  Does not allow vim to recover
          our files, and doesn't yet support setting the file as modified; just lets a 
          vim user know we're editing a file.  Commands line "-G" or "--locking", nanorc 
          option "locking".  New functions src/files.c:do_lockfile(), write_lockfile(),
          and delete_lockfile().



git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4549 35c25a1d-7b9e-4130-9fde-d3aeb78583b8