Added **NEW FRAME** marker

Intended to make it easier to pick out new receipts in log files
Merge remote-tracking branch 'origin/refactoring' into bulk_uploading
minor changes
Merge branch 'bulk_uploading' into variable_decoding

Conflicts:
	src/emonhub_listener.py
Merge remote-tracking branch 'origin/variable_decoding' into node_based_decoding