Enhance the build process

[valerio]

After switching to CMake, our configure report isn't available anymore; and there's no easy way to know what CMake configuration options are available.

We need:

• a CMakeFiles.txt option to display a configuration report after the config process is done, with all possible options shown - maybe even with how to switch the options on and off.
• something like a ./configure wrapper for CMake, which should be able to answer to the --help option with a list of configuration options, like it was when kmess was Automake-based, and maybe also automatically perform an out-of-source CMake configuration with the desired options.

The old report was generated by this file and our own options were added to ./configure by this file.

[diederik]

Configure wrapper script is added in r3007.

[valerio]

I think the configure wrapper script is more than enough. Closing.