thomasgibson/tabula-rasa: Tabula Rasa: experimentation framework for hybridization and static condensation

Version of Firedrake used in "Slate: extending Firedrake's domain-specific abstraction to hybridized solvers for geoscience and beyond." 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 Please do not cite this as a general source for Firedrake or any of its dependencies.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.htmlVersion of Firedrake used in "Slate: extending Firedrake's domain-specific abstraction to hybridized solvers for geoscience and beyond." 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 Please do not cite this as a general source for Firedrake or any of its dependencies.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.htmlfiredrake_20190329_v