There have been tons of great improvements to the plotting making
their way through trac lately.  Do any of those changes for ranges
etc. deal with the very weird output one gets for e.g.

sage: plot((x-1)/(x+2),-4,4)

or, worse,

sage: plot(tan,-20,20)

In both cases, Sage isn't "recognizing" the asymptotes, and then the
scale gets thrown off, not to mention the non-existent-but-plotted
connections across discontinuities.

I should point out that this is under 3.0.6, and I was unable to log
in to the online notebook to verify this still exists under 3.1.1;
there is nothing after 3.0.6 at http://www.sagemath.org/src/announce/,
so I couldn't check the changelog very easily to see if this had been
fixed, though I couldn't find anything quite about this specific issue
in the trac either.

Thanks for the improvements, and thanks for any answers to this.
- kcrisman

PS - related to this are two points which don't seem to fit elsewhere
but about which I am curious:
1) It would be useful for those involved to put a summary of the
plotting improvements/changes in internals on a wiki page, once the
whole overhaul is complete.
2) Specifically, will the old syntax plot(sin,-5,5) continue to be
valid under the new plot(sin,(-5,5)) syntax, or will it be completely
deprecated?  Despite the logic of the new syntax, the old one is
REALLY convenient and intuitive, and it would be a shame to have to
change all those old worksheets...
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