Feat/new flavor scheme

Created by: garloff

This is a first version how the new flavor naming v2 could look like to address issue #190 (closed), reflecting the considerations from #192 (closed). A document that describes how the transition can be done smoothly still needs to be written. The check tools which has been updated along with the standard can be run in a mode to accept both old v1 and new v2 flavor names, which hints how a transition might be implemented. To check for v1 compliance, the tool has an option -1 now, so we don't need to carry an old version of the test tool.