debian: fix package build, broken by c5e2007.

Auto generated manpages are in different locations than static ones, so
libsmack-dev.manpages needs to be modified.
It now includes all generated section 3 manuals.
doc: fix parallel build, broken by c5e2007.

Parallel make failed, because dependencies were not properly specified
for all auto generated man pages.
doc: show version

Fix documentation to show correct package version.