This converts the CMake license to a pure 3-clause OSI-approved BSD
License. We drop the previous license clause requiring modified
versions to be plainly marked. We also update the CMake copyright to
cover the full development time range.
This adds documentation of the APPEND option to the configure, build,
test, memcheck, and coverage commands. The docs leave specific
semantics for the dashboard server to define.
This corrects the terse documentation and adds detail to the full
documentation of some commands. It also normalizes the layout of the
documentation string endings to make adding lines easier.