Implement simple linear primal-primal flat #115
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Currently, we support a flat operation from dual vector-fields to primal one-forms. However, it is sometimes convenient to have a flat operation from primal vector-fields to primal one-forms.
So, this PR adds an implementation of such a flat operation. It is pedagogically simple to understand, and is quick to implement. It assumes that a the values of a primal vector-field can be linearly-interpolated along primal edges. Integrating such a vector-field along one of these primal edges (line-segments) is equivalent to taking the dot-product of the average value of the vector-field with the vector represented by that line segment. This scheme perfectly flattens static vector-fields, of course.
Future PRs can add a cached version of this operation, as in the other "flat matrix" operation, or as a kernel. The interpolation scheme can be improved by doing a modicum of algebra to determine appropriate weights concerning more samples of the vector-field.