in case something wents wrong ...

free got ifaddrs.
review memory stats ...

review memory stats related to "Belongs cached to free?"
* http://simon.zekar.com/2009/01/30/understanding-freebsd-memory-usage/

Even if FreeBSD currently always reports "0" for cached, we might be
safer for future versions. Similar is to expect for other BSD's.
Fix not working process stats on OpenBSD.

This fix includes an adaption to an early behaviour common to OpenBSD and DragonflyBSD.
OpenBSD improves and needs different (but hard to check) behaviour.
Currently we have a state working on both recent releases - further tests on -STABLE
might show what remains ...
Merge branch 'jens-mega-patch' of github.com:/tdb/libstatgrab into jens-mega-patch