if we run into unformatted pages, they're candidate for mandoc (otherwise,
groff should have formatted them already).
We shouldn't ever try to run them thru tbl first, since mandoc takes care
of enough tbl constructs, and will get confused at roff low-level anyways.
So, just run thru cat to avoid changing xman too much.
Since mandoc doesn't have a -Tlatin1 mode, approximate it with -Tascii.
-Tutf8 is definitely out of question until xman talks utf8.
okay matthieu@
