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----------------------------- November 19, 2003 --------------------------------
Separated PlotzPerl::Input from the rest of PlotzPerl::IO. In theory, I can
now separate out PlotzPerl::Output, tho that's harder. (Almost everything now
in PPI will go in there!)

----------------------------- November 20, 2003 --------------------------------
Looks like stuff in the upper window doesn't get written to stream 2, but DOES
get written to stream 3.

----------------------------- November 25, 2003 --------------------------------
Thinking about streaming

----------------------------- November 26, 2003 --------------------------------
Wrote lots of notes on streaming plans. I think I have a workable system.
Text is turned into PP::Text objects which are blessed scalarrefs; the
subclasses determine whether the text was input or output, etc.

PP::Output tries to write to every stream (but returns immediately if it
wrote to stream 3). Each OutputStream tests itself to see whether it's
selected, and also to see whether there are other reasons not to accept
the stream. If the stream does accept, then the text is streamed to it.
If buffering is on for that stream/window/buffer_mode, then it gets
buffered, otherwise simply written. Only stream 1 ever knows about
the Screen object (although stream 2 needs to know which window we're