firedrakeproject/tsfc: The Two Stage Form Compiler

Retrying Version of Firedrake used in 'Optimal-transport-based mesh adaptivity on the plane and sphere using finite elements' v3. This release is specifically created to document the version of Firedrake used in a particular set of experiments. Please do not cite this as a general source for Firedrake or any of its dependencies. Instead, refer to http://www.firedrakeproject.org/publications.htm