[CMake] Emacs: Addition to cmake-model.el to show cmake documentation

[Bill Hoffman]

Martin Apel wrote:
> Hi all,
> 
> Inspired by the Emacs command cperl-perldoc-at-point I wrote a little
> command to show the CMake documentation of the command on which the
> cursor is currently positioned. It will open another buffer and show the
> documentation generated from "cmake --help-command <command>" in that
> buffer. I found it very useful during creating CMakeLists.txt files.
> 
> Bill, maybe it makes sense to integrate this into cmake-mode.el?
> 

Looks neat.  Is there a better way in emacs to set the path to CMake? 
On many systems I do not put cmake into the PATH.

-Bill