lib/python/machinekit: added service module
machinetalk/mkwrapper: made use of the service module
machinetalk-protobuf: added interp_name field
emc/rs274ngc/previewmodule: made use of interp_name field
python/machinekit/service: changed ipv4 to ip
machinetalk/mkwrapper: simplified interface handling, made use of interp_name field
previewmodule: reactive check_abort function
preview demo: run with -a to abort after first second of preview run

needs a large ngc file

Conflicts:
	src/emc/rs274ngc/preview/rs274preview.py