Manpage merged

Purpose: Update documentation, automatically generate argument documentation from code.

Details:
- Added a generator that automatically creates a docbook XML from the *args* argument array information.
- Added a new *Examples* section containing the usage examples from command line help with a more detailed description.
- Prepared a *Channel* (currently empty) section to add description of channel specifics.
- The base docbook file is now generated by CMake allowing to add CMake variables in the template.
- Added CMake targets to automatically generate a valid manpage from the source
- Added a CMake script returning the current date in ISO format.