Galerkin projection interpolation can fail in serial with periodic domains.

[jrper]

The current implementation of serial mesh-to-mesh interpolation deals with periodic boundaries by cloning the position mesh across the boundary, but doesn't fix the connectivity. This then means that the frontal intersection finder routines can't find the additional mass. I'll test whether this was fixed in @stephankramer's Parallel periodic adaptive branch when I get round to it.