preproc.sh now translates the {{INSTALL_PREFIX}} string as well as the
{{OWLPS_VERSION}} string. Both values are now obtained from the
corresponding environment variables (OWLPS_VERSION was previously
obtained through a special git command).
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.