export functions working with auxiliary data using StablePtr
export with additional parameters
make named pipe unique so multiple instances of mplayer' place nicely.
make named pipe unique so multiple instances of mplayer' place nicely. rm unnecc. deletion of temp file
Merge pull request #22 from timsears/uniquenamedpipe

Uniquenamedpipe
sigma in imagproc demo
Merge branch 'develop'
rm fifo (it is opened twice)