Issue #235 Remove copyright and license information from test implementations.

Any tests are written specifically for the CMake BASIS library functions. No need to have a copyright or license notice for such files which are of no use to others (beside maybe a reference).
Issue #235 Remove copyright and license from example files.
Issue #235 Add "license" link reference to download page.

Shorter than "software-license" such that the full URL fits in 80 characters.
Issue #235 Separate copyright and license information in file header from Doxygen comment to not duplicate it on every Doxygen generated API reference page. Remove contact from file header.

This information is in the documentation to be found where appropriate. It is only contained in the files themselves for when they are copied by somebody to another project. The contact information can be found via the project help.