Simplified rhs assembly (all element parts are assembled in one place)
Simplified rhs assembly (all element parts are assembled in one place)

This makes the rhs assembly more costly as the coarse base function
set is evaluated more often. In turn, the assembly code is much
more readable. Also, this may make sense if the right hand side
function f has fluctuations on the small scale.

wwu-numerik/DUNE-Multiscale,wwu-numerik/DUNE-Multiscale