[fmatrix] more copying of methods from dune-common to avoid buggy LU …

Function to check for 0 without warnings, add dgemv, dpocon

[cmake.modules.XtTooling] add cpp/hpp files to format target

Remove assert macros, improve coordinate converter

They cause warnings in every module even if they are not used, so just
remove them. We can still add them back if someone complains.

[common.ranges] fix headercheck in dune-gdt

__CLASS__ is seemingly used nowhere currently. Which is good because it
definitely does not give you only a class name.

Fix color output, add blocked matrix test

Remove Lpsolve

[fmatrix/fvector] add blocked versions and tests