Allow -u flag to pod2man.
Add probscript to exercise manpage generation.
Tidy/simplify t/unicode.t
Test, implement adding "-u" to pod2man when >= 5.008.
Better error message on manpage open.
Force build of manpages override $Config{man*}.
Skip if manpage not generated.
Also specify MAN1EXT override.
Skip test unless Pod::Man >= 2.17.