there were a couple of things where imgssapi was not compatible
with the new encapsulation. I did a somewhat dirty fix. The real
solution would be to turn gssapi functionality into a netstream
driver, which is too much for now (after all, we want to release
some time AND we need to have the code mature in practice
before we go for the next target...).

reduced dependencies, moved non-runtime files to its own directory except
for some whom's status is unclear

    situations. If the header was split across two packet reads, it was
    invalidly processed, causing loss or modification of messages.

    just a fix but a change in the object model. Thanks to varmojfekoj for
    providing the bug report, an initial fix and lots of good discussion
    that lead to where we finally ended up.

    scheme (like im* and om*)

- added -M rsyslogd option (allows to specify module directory location)
- converted net.c into a loadable library plugin