geometry data (bfGM, ...) should be updated in each time step - needed in updated Lagrangian formulation

There should be some way for the solver to recognize which formulation is used currently in order to behave accordingly.

I suggest adding an attribute (e.g. 'formulation') to all the TL, and UL formulation related classes. This information could then be collected somewhere in Equations.setup_terms().

It should be much easier now, as newly the geometries are updated as needed, similar to term caches. See the commits starting with 'geo'.

It works now.

Migrated to http://github.com/sfepy/sfepy/issues/99