smartset: drop infamous ascending, descending

All your friends are dead.

mercurial/revset.py

@@ -2228,22 +2228,10 b' class abstractsmartset(object):'
         """True if the set will iterate in ascending order"""
         raise NotImplementedError()
 
-    def ascending(self):
-        """Sorts the set in ascending order (in place).
-
-        This is part of the mandatory API for smartset."""
-        self.sort()
-
     def isdescending(self):
         """True if the set will iterate in descending order"""
         raise NotImplementedError()
 
-    def descending(self):
-        """Sorts the set in descending order (in place).
-
-        This is part of the mandatory API for smartset."""
-        self.sort(reverse=True)
-
     def min(self):
         """return the minimum element in the set"""
         if self.fastasc is not None: