- Changed do_insertfile to (a) report multibuffer status at the prompt and allowing...

- Changed do_insertfile to (a) report multibuffer status at the  prompt and allowing it to be toggled, taking into account the need to keep the translatable strings, and (b) added a variable inspath to keep track of what the string was before toggling.  I'm sure there's bugs, have at it

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@1269 35c25a1d-7b9e-4130-9fde-d3aeb78583b8