Updated tasks
Changed module-level update to only update contourplot from contourplot submodule
bf(x,y,z) now, instead of array(xyz).

Makes contourplotting easier, and we have the
.mesh() routine when we want to eval on a 1d mesh.
Top level contourplot() routine and simplified contour meshing.
Cleaned documentation
Fixed a reference to "index" (sb "iindex")
Fixed doctests.