Merge branch 'nschloe/switch-trilinos-belos'
Doc fix for dual Poisson problem
Remove what seems to be debugging output.
Do not run 3D P5 Poisson test in benchmarks.

Code is very large and often hangs the buildbots. Reduce size of other generated code by not creating basis evaluation functions.
Merge branch 'garth/fix-bench-poisson-file-size' into next