Weak Nitsche freeslip integrands, improved and extended external parameter handling
- weak Nitsche freeslip boundary integrands for Stokes flow
- FE coeffs now passed with dicts instead of lists of tuples
- constant scalar and matrix coefficients can now easily be added with the
scalars
andmatrix
callables passed by the process_integrand() function - added the coordinates as a symbol to the integrand signature