Automatic flushing for PipeReader (with Patch)

[Jochen Keil]

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Hello,

I've written a small patch for PipeReader which does the following.

After a given amount of time (atm in tenth of seconds) the input is
"flushed" i.e. overwritten with "" so that any previous input becomes
invisible.

The old behaviour is still available by specifying 0 as flush delay.

As an use case example, I'm using it to temporarily display the
current Volume and Brightness while changing it. Like a much simpler
OSD. :)
If anyone is interested in the shell script that I'm using for this,
just send me a mail.

Best Wishes,

Jochen
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