Solve App and Plot

[jte]

Two of the things I'd like to see in the Solve app would be:

- A "rotate" menu key in the plot view that would cycle the horizontal / independent variable through the variables used in the plotted expression(s).

- A Plot-Table-like view which shows, on the right, the values of all variables used in the plotted expression(s), along with some mechanism for entering new values. (Possible bonus: allow for old plots — those with old values — to be shown as "ghosts" rather than completely removed.)