Reimplemented munge authentication. New version relies on the munge libr...

...ary instead of exec resulting in better server performance and stability. Most of code contributed by Mariusz Mamonski from PSNC. Old code can still be used with --enable-munge-exec.

After applying this patch autoreconf -i is needed in order to use updated configure.ac

Code have been running successuly here in Cyfronet for more than one year now. (~17k cores)