Remove modules set from the i386 install cd

It is not particularly useful to be able to load modules while
installing on i386, probably the most useful one is dtrace,
and this takes up about 20mb on a port that is already exceeding
CD limits. Most stuff you'd want to use while installing is already
in GENERIC.

The modules set is still available compressed for installing into
a target system, meaning modules are available after installation.

While here, add man set to the installation DVD, it's helpful to be able
to read e.g. the man page for fdisk when rescuing a system.

(nia)