when connecting signals, allow multiple user_args
when connecting signals, allow multiple user_args

This additionally deprecates the existing (single) user_arg arguments in
favor of the new user_args argument. Also note that the user_args are
added at the start of the argument list, while the old user_arg was
appended to the end.

urwid/urwid,urwid/urwid,ivanov/urwid,foreni-packages/urwid,hkoof/urwid,douglas-larocca/urwid,wardi/urwid,tonycpsu/urwid,foreni-packages/urwid,inducer/urwid,ivanov/urwid,harlowja/urwid,rndusr/urwid,wardi/urwid,drestebon/urwid,urwid/urwid,douglas-larocca/urwid,inducer/urwid,foreni-packages/urwid,tonycpsu/urwid,douglas-larocca/urwid,wardi/urwid,ivanov/urwid,hkoof/urwid,hkoof/urwid,drestebon/urwid,tonycpsu/urwid,rndusr/urwid,harlowja/urwid,rndusr/urwid,drestebon/urwid,inducer/urwid,harlowja/urwid