If it is not broken then break it:

If it is not broken then break it:

* Fix lyx2lyx default debug level
* Fix lyx2lyx verbose mode
* Use stderr consistently
* Update default version when running from src directory
* Output prettier and more useful information
* Allow to specify the target version, the format will be accordingly
* Have a more reliable chain of dependencies (fixes corner cases < 2.15)
* Add placeholder for future file format changes

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@27506 a592a061-630c-0410-9148-cb99ea01b6c8