[CMake] CTest / CDash integration

[Martin Baute]

> Perhaps it would help if I explained these 2 different ways of using CTest.

/me slaps forehead...

Indeed, this clarifies quite a few things. I hadn't considered
those two ways as distinct, but merely complementing each other,
and wondered about the apparently conflicting documentation.

I will mull this over.

Regards,
--
Martin Baute
solar at rootdirectory.de