Merge branch 'v7-stable' into c9
experimental: make impstats return delta values where possible

Conflicts:

	plugins/impstats/impstats.c
	plugins/imptcp/imptcp.c
impstats: reset stats counters no matter if CEE or regular mode is used
impstats: implement parameter "resetCounters"

it provides the capability to make impstats emit deltas in contrast to
accumulated counter values (see doc for details).

Conflicts:

	plugins/impstats/impstats.c
set custom branch version
imudp: add "defaultTZ" input config parameter
Merge branch 'c9'

Conflicts:
	configure.ac
	plugins/impstats/impstats.c
	plugins/imptcp/imptcp.c
	plugins/imudp/imudp.c
maintain ChangeLog