Update UFL to 2017.2

.gitmodules

@@ -3,7 +3,7 @@
 	url = https://gitlab.tiker.net/inducer/loopy.git
 [submodule "python/ufl"]
 	path = python/ufl
-	url = https://parcomp-git.iwr.uni-heidelberg.de/dominic/ufl.git
+	url = https://bitbucket.org/fenics-project/ufl.git
 [submodule "python/pymbolic"]
 	path = python/pymbolic
 	url = https://github.com/inducer/pymbolic.git

patches/apply_patches.sh

@@ -13,7 +13,3 @@ pushd python/ufl
 git apply ../../patches/ufl/conditional-uflid.patch
 git apply ../../patches/ufl/0001-Remove-special-case-for-variable-in-ufl2dot.patch
 popd
-
-pushd python/ufl
-git apply ../../patches/ufl/tensor-product-element.patch
-popd

patches/ufl/tensor-product-element.patch

-commit f87dcd18d765b0200808b79b2e7374f82a0c6199
-Author: René Heß <rene.hess@iwr.uni-heidelberg.de>
-Date:   Tue Aug 29 14:56:17 2017 +0200
-
-    Patch for TensorProductElements
-
-diff --git a/ufl/algorithms/compute_form_data.py b/ufl/algorithms/compute_form_data.py
-index 3388bbfc..1cef3924 100644
---- a/ufl/algorithms/compute_form_data.py
-+++ b/ufl/algorithms/compute_form_data.py
-@@ -56,7 +56,7 @@ def _auto_select_degree(elements):
-     """
-     # Use max degree of all elements, at least 1 (to work with
-     # Lagrange elements)
--    return max({e.degree() for e in elements} - {None} | {1})
-+    return max({e.degree() if not isinstance(e.degree(), tuple) else max(e.degree()) for e in elements} - {None} | {1})
- 
- 
- def _compute_element_mapping(form):

ufl @ 5a9593c9

-Subproject commit 962d56f65821fb9c50ca4a5a858882c472243431
+Subproject commit 5a9593c956fc843eee6ce3a2ae2b9cbc4aec62bf