Improved the format of the schema.
Updated schema.
More schema improvements.
More schema improvements.
More improvements to schema.
Updated schema paths.
Updated the schema paths.

Also updated the swe_mms_p2p1 test based on the schema changes.
Updated schema paths.
Fixed the swe_standing_wave .swml file following the recent schema updates.
Now using a VectorFunctionSpace inside a MixedFunctionSpace.
More updates following schema structure changes.