Doxygen comments are now used in libowlps, libowlps-client and
libowlps-resultreader. doc/Doxyfile was added as well as CMake rules to
generate man pages for the libraries' header files.
Add the directory for all the future documentation. The file owlps.t2t
is aimed at being the entry point of all the other documentation pages.
Included are a Makefile to generate man pages and a couple of scripts to
improve the rendering.