Change the current saving policy to ignore formatting changes

With this change the old saving policy (which is our "reference here") 
will detect if a model needs to be saved by loading the filesystem
version, reserializing it in memory and compare this serialization with
the serialization of the one in the one in the resourceset.

This is necessary to avoid re-serializing because of changes of
serialization options like LINE_DELIMITER.

This is in no way something which should get commited on master and
shipped, this is only use to compare with the new implementation.