new tool to regenerate all message files
With each message file *.mes there are a .h and a .cc. The .cc is used to build the message list for the documentation.
As git does not keep file times it is possible to introduce inconsistencies for instance during a rebase. So we need a tool to force such regeneration and to integrate it in the release process.
Note the list for message files is in doc/sphinx/mes-files.txt