Changes:

- Improve the -ecm patch.
- Add -formatargspec patch to silence doc-building warnings.
- Add -data-elliptic_curves_large subpackage.
- Build with bliss, coxeter3, and mcqd support.
- Fix typo that made the singular.hlp file inaccessible.
- Add more gap packages to get closer to the set shipped by upstream.
- Refactor Requires so they apply to the correct subpackages.
- More python 3 patching due to changes in python 3.8.
- Use upstream's method of installing jupyter support.
- Obsolete the sagemath-notebook-export subpackage.

sagemath-escape.patch

@@ -1,3 +1,15 @@
+diff -up src/sage/algebras/clifford_algebra.py.orig src/sage/algebras/clifford_algebra.py
+--- src/sage/algebras/clifford_algebra.py.orig	2019-06-26 14:41:04.000000000 -0600
++++ src/sage/algebras/clifford_algebra.py	2019-09-11 15:46:56.658681891 -0600
+@@ -1520,7 +1520,7 @@ class ExteriorAlgebra(CliffordAlgebra):
+         return term
+ 
+     def _ascii_art_term(self, m):
+-        """
++        r"""
+         Return ascii art for the basis element indexed by ``m``.
+ 
+         EXAMPLES::
 diff -up src/sage/combinat/crystals/alcove_path.py.orig src/sage/combinat/crystals/alcove_path.py
 --- src/sage/combinat/crystals/alcove_path.py.orig	2019-06-26 14:41:04.000000000 -0600
 +++ src/sage/combinat/crystals/alcove_path.py	2019-06-27 11:46:03.613253846 -0600
@@ -10,15 +22,15 @@ diff -up src/sage/combinat/crystals/alcove_path.py.orig src/sage/combinat/crysta
          search algorithm.
  
          .. WARNING::
-diff -up src/sage/homology/homology_group.py.orig src/sage/homology/homology_group.py
---- src/sage/homology/homology_group.py.orig	2019-06-26 14:41:04.000000000 -0600
-+++ src/sage/homology/homology_group.py	2019-06-27 11:46:03.614253830 -0600
-@@ -109,7 +109,7 @@ class HomologyGroup_class(AdditiveAbelia
-             sage: from sage.homology.homology_group import HomologyGroup
-             sage: H = HomologyGroup(7, ZZ, [4,4,4,4,4,7,7])
-             sage: H._latex_()
--            'C_{4}^{5} \\times C_{7} \\times C_{7}'
-+            'C_{4}^{5} \times C_{7} \times C_{7}'
-             sage: latex(HomologyGroup(6, ZZ))
-             \ZZ^{6}
-         """
+diff -up src/sage/rings/lazy_laurent_series_ring.py.orig src/sage/rings/lazy_laurent_series_ring.py
+--- src/sage/rings/lazy_laurent_series_ring.py.orig	2019-06-26 14:41:05.000000000 -0600
++++ src/sage/rings/lazy_laurent_series_ring.py	2019-09-11 15:41:19.871081870 -0600
+@@ -260,7 +260,7 @@ class LazyLaurentSeriesRing(UniqueRepres
+         return self._element_constructor_(0)
+ 
+     def series(self, coefficient, valuation, constant=None):
+-        """
++        r"""
+         Return a lazy Laurent series.
+ 
+         INPUT: