For gnuplot 4.2 rc3

[Petr M. <mi...@ph...>]

I wish rc3 appears soon. There, I propose the following changes:

1. Apply [ gnuplot-Bugs-1612995 ] Flag 'interactive' not reset to FALSE
   after '-' plot script

2. I propose to set
	--with-readline=gnu
   to be the default, instead of the built-in readline.
   People (except for some distributors) always use this option,
   and setting this to default will save us time to answer those
   permanent emails "tabulator does not work in the new version".

3. www.gnuplot.info is not mirroring gnuplot.sourceforge.net, for
   a long time, nobody responded until now. Is still Clark Gaylord the
   persons with the access there?

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PM