quaternion, improve quat::rotate(vec3, vec3) to gracefully handle corner
cases, and add unit tests for all of these.

Added workbench, for personnal experimentation.

from the end. Also added Array::RemoveSwap() for faster removes at the
expense of element ordering.

- removed 0 CR characters
 - removed 21 trailing whitespaces
 - replaced 42 tabs with spaces

optimisation flag -Os instead of -O3.

- removed 49 CR characters
 - removed 2 trailing whitespaces
 - replaced 1622 tabs with spaces

return an already created object if necessary.

compiler bugs in the Xcode toolchain.

positive values, and add a unit test for rand<int>.

that lets us draw integer random values too.

improved numerical stability on i386.

string concatenation unit tests.

because we actually have a bug!

for substrings, and the corresponding unit tests.

and add a simple unit test function.