Timed plotting

This package provides two easy ways of updating plots.
The former allows to append new points in 2d plots. It automatically searches for the desired figure (defined by its name) and updates all plot lines in it.
The latter allows for real time updates of "ez" plots (ezsurf, ezmesh, ...) by using a timer. In this way, it is not necessary to manually refresh the plot whenever some attributes of the plotted function change. Please notice that the attributes of the function must be subclasses of the "handle" class.