Removed -format and -filter from send(1); they were just passed to (s)post(8).

-(no)format switches normalization of addresses on/off. If spost would
support address normalization, then it should be always enabled or disabled.
But as spost doesn't support it it's a no-op in mmh anyway.
-filter is for generating non-MIME messages for Bcc recipients. We'll use
MIME in this case ... as soon as this code is written.
Note: spost is still lagging behind the current development.