[common.traits] updated stuff.function.global signature
[fem.algorithm] added dune-gdt compatible problem nine data functions
* epsilon = 0.05 is hardwired
[fem.algorithm] put everything in a class so we can exchange backends
[fem.algorithm] updated dune-gdt usage
[fem.algorithm] updated dune-gdt usage
* assembly time goes down about half
[msfem.param] make the grid a bit smaller