Backport 50c2f40712bab91e4bad1b2aa14c8e9ac1d2dc0a (issue #52) for the v7-stable branch.
removed obsolete --disable-fsstnd configure option

Thanks to Thomas D. for alerting us.
Closes: https://github.com/rsyslog/rsyslog/issues/72
Merge branch 'v7-stable' into v8-stable
Merge branch 'v8-stable'
maintain ChangeLog
Merge branch 'backport_issue_52' of https://github.com/Whissi/rsyslog into v7-stable

Conflicts:
	configure.ac
Merge branch 'v7-stable' into v8-stable

Conflicts:
	configure.ac
Merge branch 'v8-stable'
imdiag: clarify state

see also: https://github.com/rsyslog/rsyslog/issues/71
Merge branch 'v7-stable' into v8-stable
Merge branch 'v8-stable'
improve debug output for ReduceRepeatMsgs
janitor: add skeleton
janitor: add base plumbing
janitor: base functionality given for omfile
janitor: cleanup on exit
janitor omfile: add impstats support for close timeouts

also some minor cleanup at other spots
maintain ChangeLog
make omgssapi build under v8
add some reasoning for last patch to ChangeLog