win32 fixes by Stefan . Ludewig . exitgames . com * added portable plbasename since basename is not available on stock win32 * rrd_update was using %d to show a timestamp ... %lli is better since it also will show 64bit time_t correctly. git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk/program@1716 a5681a0c-68f1-0310-ab6d-d61299d08faa