tests/test-mq-qgoto.out

use 'x is None' instead of 'x == None'

The built-in None object is a singleton and it is therefore safe to
compare memory addresses with is. It is also faster, how much depends
on the object being compared. For a simple type like str I get:

            | s = "foo" | s = None
  ----------+-----------+----------
  s == None | 0.25 usec | 0.21 usec
  s is None | 0.17 usec | 0.17 usec

adding a
now at: a.patch
applying b.patch
applying c.patch
now at: c.patch
now at: b.patch

% Using index
now at: a.patch
applying b.patch
applying c.patch
now at: c.patch

% No warnings when using index
now at: b.patch
applying c.patch
applying bug314159
now at: bug314159

% Detect ambiguous non-index
patch name "14" is ambiguous:
  bug314159
  bug141421
abort: patch 14 not in series