Additional KiCad documentation and presentations.

Since this documentation package has a separate release time-line,
you may have to specify the version of the installed KiCad package if
it is newer than this documentation package.  At the time of writing,
it was "bzr_20130325". To specify another release, run this SlackBuild
as follows:

  # KICAD_VERSION="bzr_yyyymmdd" ./kicad-doc.SlackBuild
