This change updates the Far::LimitStencilFactory to
to support options to generate 1st and 2nd derivative
limit stencil weights.
For backward compatibility, the option to generate 1st
derivatives defaults to true. While for efficiency,
the option to generate 2nd derivatives defaults to false.
Also, updated the Far::LimitStencil class to expose
computed 1st and 2nd derivative limit stencil weights.
To encapsulate endcap functions from public API, add methods to
tell the number of patch points needed (GetNumLocalPoints()) and
to compute those patch points as a result of change of basis from
the refined vertices (ComputeLocalPointValues()).
ComputeLocalPointValues takes contiguous source data of all levels
including level0 control vertices.
