multiple consistency improvements for restart files

- make defines and enumerators automatically consistent by moving them to a shared header file
- change VERSION_NUMERIC to FORMAT_REVISION (and corresponding function names)
- new class member revision in ReadRestart class to allow backward compatibility
- step current FORMAT_REVISION to 1
- write the magic string a the end of each restart
- add a check, that skips to the end of a file and checks for the magic string and then returns
  but do this only if FORMAT_REVISION is 1 or larger for backward compatibility