General: - New flag -o, --operatingdir, similar to Pico's -o mode.  New function check_operating_dir(), changes to load_file (arg), open_file_dup_search (arg), new function do_gotopos for -F.


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@767 35c25a1d-7b9e-4130-9fde-d3aeb78583b8