Suggest Copy Transfinite Properties for Periodic Slave Faces in Volumes

Presently when using periodic master/slave faces the master face meshing successfully copies to the slave face for 1D and 2D including transfinite and 'recombined' properties (i.e. generating quadrilaterals).

However to transfinite mesh a volume(, the slave faces must be separately re-declared as transfinite, otherwise MeshTransfiniteVolume(GRegion) does not recognise them as such (face.index() remains uninitialised as -1) and rejects the volume (it does not recognise the faces as 'all transfinite').