[Osalp-dev] More changes

[Bruce F. <for...@ad...>]

I have made more changes. They are:

1) Added setItem and getItem as virtual to the aflibFile base class. It
   can be used to access file format specific data. Currently only one
   is implemented. It is AFLIB_DEV_ITEM_BUFFER. This will allow one
   to set the amount of buffer used in the driver. Currently for the
   linux device the buffer lengths are set to 0.5 seconds for record
   and 0.2 seconds for play. It can be changed with a call to setItem
   and should be made after the device is openned.

2) Fixed mulaw writing for au format in the audiofile library. Also
added
   mulaw and alaw support for WAV format in audiofile library and made
   changes in aflibAuFile and aflibWavFile for these. To support these
   will require a new audiofile library. These changes have been
forwarded
   to the author of the library and he is working on the changes.

3) For all file formats that create a pipe to a seperate process I now
   route stderr to /dev/null now. It was being printed out. 

4) Made bug fixes for aflibAudioEdit class and aflibAudio for when two
   parents are used for aflibAudioEdit. Also made fixes to editor sample
   program.

Bruce Forsberg