This is the root of the download file tree.
The HEAD directory is where the latest released source will go. This file
will typically be replaced with a new version each time, without changing
the file name.
The RELEASE directory is where the most current RELEASE version will be
kept. Typically this version number will be LOWER than that found in
the 'HEAD' directory.
The ARCHIVE directory is where older RELEASE versions will be kept for
The DOC directory contains a tarball of the most recent Doxygen output.