Update to sagemath 8.7.

- Drop upstreamed -giac patch.
- Add -sagetex patch to fix a python indentation error.
- Add -rubiks patch to fix compilation of the rubiks library.
- Add -random patch to fix a non-random random bit generator.
- Drop pip3 workaround; the binary is now named just pip again.

sagemath-escape.patch

@@ -1,5 +1,6 @@
---- src/sage/combinat/crystals/alcove_path.py.orig	2019-01-14 17:16:01.000000000 -0700
-+++ src/sage/combinat/crystals/alcove_path.py	2019-02-07 15:43:21.188614487 -0700
+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	2019-03-23 16:20:34.000000000 -0600
++++ src/sage/combinat/crystals/alcove_path.py	2019-04-08 13:33:18.101386015 -0600
 @@ -383,7 +383,7 @@ class CrystalOfAlcovePaths(UniqueReprese
  
          One can compute all vertices of the crystal by finding all the
@@ -9,39 +10,9 @@
          search algorithm.
  
          .. WARNING::
---- src/sage/combinat/crystals/kirillov_reshetikhin.py.orig	2019-01-14 17:16:01.000000000 -0700
-+++ src/sage/combinat/crystals/kirillov_reshetikhin.py	2019-02-07 15:44:37.612978369 -0700
-@@ -3443,7 +3443,7 @@ class CrystalOfTableaux_E7(CrystalOfTabl
-     <sage.combinat.crystals.kirillov_reshetikhin.KR_type_E7>` `B^{7,s}`.
-     """
-     def module_generator(self, shape):
--        """
-+        r"""
-         Return the module generator of ``self`` with shape ``shape``.
- 
-         .. NOTE::
-@@ -3496,7 +3496,7 @@ class KR_type_E7(KirillovReshetikhinGene
- 
-     @cached_method
-     def A7_decomposition(self):
--        """
-+        r"""
-         Return the decomposition of ``self`` into `A_7` highest
-         weight crystals.
- 
---- src/sage/groups/perm_gps/permgroup_named.py.orig	2019-01-14 17:16:02.000000000 -0700
-+++ src/sage/groups/perm_gps/permgroup_named.py	2019-02-07 15:51:38.530055246 -0700
-@@ -3027,7 +3027,7 @@ class SuzukiGroup(PermutationGroup_uniqu
-         return "The Suzuki group over %s" % self.base_ring()
- 
- class ComplexReflectionGroup(PermutationGroup_unique):
--    """
-+    r"""
-     A finite complex reflection group as a permutation group.
- 
-     We can realize `G(m,1,n)` as `m` copies of the symmetric group
---- src/sage/homology/homology_group.py.orig	2019-01-14 17:16:03.000000000 -0700
-+++ src/sage/homology/homology_group.py	2019-02-07 15:43:21.197614413 -0700
+diff -up src/sage/homology/homology_group.py.orig src/sage/homology/homology_group.py
+--- src/sage/homology/homology_group.py.orig	2019-03-23 16:20:40.000000000 -0600
++++ src/sage/homology/homology_group.py	2019-04-08 13:33:22.436307576 -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])
@@ -51,14 +22,36 @@
              sage: latex(HomologyGroup(6, ZZ))
              \ZZ^{6}
          """
---- src/sage/rings/number_field/number_field.py.orig	2019-01-14 17:16:04.000000000 -0700
-+++ src/sage/rings/number_field/number_field.py	2019-02-07 15:43:21.220614222 -0700
-@@ -6622,7 +6622,7 @@ class NumberField_generic(WithEqualityBy
-         return U
+diff -up src/sage/rings/function_field/differential.py.orig src/sage/rings/function_field/differential.py
+--- src/sage/rings/function_field/differential.py.orig	2019-03-23 16:20:42.000000000 -0600
++++ src/sage/rings/function_field/differential.py	2019-04-09 10:42:43.202792022 -0600
+@@ -360,7 +360,7 @@ class FunctionFieldDifferential_global(F
+             return to_R(c)
  
-     def S_unit_solutions(self, S=[], prec=106, include_exponents=False, include_bound=False, proof=None):
+     def cartier(self):
 -        """
 +        r"""
-         Return all solutions to the S-unit equation ``x + y = 1`` over K.
+         Return the image of the differential by the Cartier operator.
  
-         INPUT:
+         The Cartier operator operates on differentials. Let `x` be a separating
+diff -up src/sage/rings/function_field/divisor.py.orig src/sage/rings/function_field/divisor.py
+--- src/sage/rings/function_field/divisor.py.orig	2019-03-23 16:20:42.000000000 -0600
++++ src/sage/rings/function_field/divisor.py	2019-04-09 10:42:22.061135616 -0600
+@@ -531,7 +531,7 @@ class FunctionFieldDivisor(ModuleElement
+         return basis, coordinates_func
+ 
+     def basis_differential_space(self):
+-        """
++        r"""
+         Return a basis of the space of differentials `\Omega(D)`
+         for the divisor `D`.
+ 
+@@ -554,7 +554,7 @@ class FunctionFieldDivisor(ModuleElement
+         return [W.element_class(W, f) for f in fbasis]
+ 
+     def differential_space(self):
+-        """
++        r"""
+         Return the vector space of the differential space `\Omega(D)` of the divisor `D`.
+ 
+         OUTPUT: