Revert "Add /mnt/hgfs as hgfs mountpoint."

Although the idea from the Ubuntu people to ship the mountpoint
in the package is nice, lintian is rather unhappy about it.

This reverts commit 1e7d8645e48f601e79eb5771e05272b367fa4eb1.
Remove procps support for now.

Unfortunately the procps package in unstable is rather broken, procps
support will be enabled again when the new procps version managed to
migrate to testing.
Updating changelog.