Doc++
OpenGL ES build fixes.
Build fix.

I have NO IDEA how this did compile and work.
GCC 4.6 compatibility: no delegating constructors.
Trade: no comma at the end of enumeration list.

It visually punishes me.
Math: merge constexpr test of BoolVector into other test cases.
Math: test "implicitness" of value constructors.
Math: test copy construction from base classes.

Copy construction from the same class should just work.
Math: minor test code reorganization.
Added thoughts about unit tests to Coding Style.