- bugfix for plotModel/ plotSphereEnergy method

Making the switch between direct out and a BRIR convolution involved more obvious for itaVA with RAVEN experimental script.

Adding NatNetML version display for itaVA setup (to check against the itaOptitrack dll). Please avoid using different versions, i.e. 2.10 for VA v2017.a)

Updating examples for itaVA usage, although new version v2017a is available, the interface has not changed, hence the old itaVA is still valid.

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.

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