A collection of fixes to get parallel & adaptivity behaving.
Merge branch 'fluidity-core/MultiFluids_Dev' of github.com:jrper/MultiFluidFluidity into fluidity-core/MultiFluids_Dev
Merge branch 'fluidity-core/MultiFluids_Dev' of github.com:jrper/MultiFluidFluidity into fluidity-core/MultiFluids_Dev