Adding validation of metadata in daffv17 writer. This was causing problems when converting from daffv15. Problem could be solved if the metadata of each record data set is also converted into new format (and not only global metadata). But seldom used, so far.

this was the result of the reduction of the page_size.
this should now work. i did not test this very much, especially recording

- itaRavenProject: fixed bug: projectTag is now intialized preventing RavenOutput folder from being deleted
- itaRavenProject: finished implementation of plot routines for materials (plotMaterialsAbsorption & plotMaterialsScattering)

folder