Removes references to incompressible_solid phase in the codebase.
This phase type references ConstDensityThermo phase, which is a
non-physical model and is to be deprecated, with Cantera 2.5. In
order to enable deprecation, the following changes are hereby made:
- Changes oxide_bulk phase type from incompressible_solid to lattice in sofc.cti
- Changes test_convert.py so that it interrogates the density_mole of the bulk_oxide, rather than density_mass