Ext13 is a collection of various externals for Pd

* catch13~, throw13~, send13~, receive13~: alternate versions that accept a set msg * mandelbrot, mandelbrot~: calculcate mandelbrot data * wavinfo: get info from WAV files * strippath: strip the path from a filename * filesize: get the size of a file * openpatch: open a patch file with a message * ftos: convert a float to symbol * ossmixer: control the OSS mixer * cdplayer: control the CDROM drive * kalashnikov: send out many bangs