Merge branch 'master-var-refactor' into tmp
add module mmsequence
bugfix: abort if "if $syslogfacility-text..." was being used
doc: update ChangeLog
Merge branch 'v7-stable'
undo "localhostname property handling simplification", which broke things

in v7.5, this is not a simplification but actually complicates things. While
we could fix the effects by patching other places, the end result would be
anything else but simpler. So we undid that change.
Merge branch 'master' into tmp
doc: mention new features in ChangeLog
refactor regression fix: misadressing in property name debug output
add debug output for global vars (unsupported!) during property filter evaluation
prepare for 7.5.6 release
doc: mmsequence was missing in ChangeLog
Merge branch 'master' into master-ruleeng
impstats: cleanup
add debug output for worker actions
milestone: action mutex removed

This means actions may now be called concurrently and must make
provisions themselves to handle multi-threading.