Add soundfiler outlet
this adds the right outlet to [soundfiler] plus a few other updates to d_soundfile.c
It also adds the "-ascii" flag and associated ascii reader for [soundfiler]
To merge:
- need to change all the "read" and "write" errors to actual helpful text instead of just showing the generic usage message
- add the classname for the error messages
- test the hell out of everything (may take some time)