* We now make sure the aout plugin buffers always contain between
AOUT_BUFFER_DURATION/2 and AOUT_BUFFER_DURATION*3/2 worth of audio.
This should solve the audio buffer underruns.

* fix for the bug in input when filename contains a '@' character.

* simplified the win32 specific changes to the input parser. ( I think
we can safely assume that no access plugin name will have a length of
one character)