gnuplot development

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Fixed, sort of, in CVS. It now does a better job of estimating the
vertical space required for rotated labels on the x or x2 axes. But it's
still not perfect, and probably cannot be, because the core gnuplot code
does not really know about font sizes and character spacing. You may still
have to tweak the margins using "set bmargin ..." and friends.

This fix should probably go into the 4.2 branch also, but I'll wait to see
if any problems are found in the CVS version.

I am re-naming this bug report.
It is nothing to do with the png/gif driver in particular.
The core code does not consider rotation angle when it reserves space for
the axis labels.