Ticket #3044: invalid order of filename and line number for external editor.

Most applications require the line number to precede the filename,
with apparently 'vim' and 'mcedit' being the only exceptions
(they accept both possible orders). E.g. 'emacs +10 /etc/services'
opens that file at line 10, but 'emacs /etc/services +10' simply
ignores the line number.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>