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.
(cherry picked from commit b3b70c21b75cc5e92d7334406557a8f49d0b4714)
doc: fix parallel build, broken by c5e2007.

Parallel make failed, because dependencies were not properly specified
for all auto generated man pages.
(cherry picked from commit d9e0abc8657dc1ee5aab391af4543a7cd1c9d757)
doc: show version

Fix documentation to show correct package version.
(cherry picked from commit 399e3a662c0ddb81cae94804a96416ae856e7507)