errorbar does not work as advertised

[Francesco Potorti`]

I see three problems with the errorbar function.

First, the styles "#" (boxes) and "#~" (boxerrorbars) are not described
the help string.  I they are intended to map the gnuplot styles, I think
that they are redundant, and only "#~>" (boxxyerrorbars) should be left.

Second, all box styles are ignored and treated like errorbar styles.
The issue, as far as I understand, is that the line object has no
attribute specifyng the type of error to plot.  If this is the right way
to go, I can propose a changeset so that __errplot__ adds an errorstyle
attribute to be used by __go_draw_axes__.

Third, if two or three vector arguments are given, the xerror ">"
specification is ignored, and vertical bars are drawn instead.  If this
is intended behaviour, I can prepare a changeset to clarify the errorbar
help string.  However, I suspect that a behaviour similar to gnuplot's
was intended; in this case, I can try to write a changeset to obtain it.

-- 
Francesco Potortì (ricercatore)        Voice: +39 050 315 3058 (op.2111)
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