Add a function to get the path of the repository on disk from other apache modules. * subversion/mod_dav_svn/mod_dav_svn.c (dav_svn_get_fs_dir): returns the path to the repository on disk * subversion/include/mod_dav_svn.h (dav_svn_get_fs_dir): declare the function and make it public to the for other apache modules.