Lowecase didn't prove to be better, because Doxygen cannot implicitly
link to it and it collides with non-type template parameters and private
variables.
Currently moved only non-square functionality from Matrix there. Also
static constant members such as row/column count and size are now
lowercase, as they are variables, not types.
Now we can use CORRADE_COMPARE() almost exclusively for comparing
Vector, Matrix instances and all containers from STL. Tests running time
for all 31 tests is now around 0.1 sec instead of two seconds like
before.
Disabled compilation of all benchmarks, because TestSuite cannot handle
them yet.
PKGBUILD from AUR now can shamelessly use check() function without
unnecessary dependencies.