add a few more items to the TODO list

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@3626 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

TODO

@@ -21,6 +21,12 @@ For the next version:
   e.g. specify a different alternate spell checker depending on which
   file type we have open.
 - Allow text searches in the help browser.
+- Allow setting marks ("nanodes", not to be confused with the mark set
+  via Ctrl-^) at various lines and/or columns in the buffer, and allow
+  movement between them with a single keystroke.
+- Add the ability to move to different lines of the screen with a single
+  keystroke, e.g. M-` to go to the top line, M-& to go to the center
+  line, and M-' to go to the last line.
 
 Old requests: