Merge branch '1.3.x'

* 1.3.x: (101 commits)
  rand.c: Show keyword argument as optional.
  mp.c: Fix punctuation error in docstrings.
  t/t-*.py: Use the `WriteBuffer.contents' property.
  t/t-bytes.py: Check that indexing, slicing, etc. return `C.ByteString'.
  t/t-algorithms.py: Add a simple test for `Keccak1600.copy'.
  t/t-algorithms.py: Add tests for other HSalsa20 and HChaCha key sizes.
  t/t-algorithms.py: Add AEAD tests.
  t/t-algorithms.py: Add tests for the new `KeySZ.pad' method.
  catacomb/__init__.py (KeySZRange.pad): Return correct value.
  algorithms.c: Propagate `AEADF_NOAAD' to `aad' objects.
  algorithms.c (AEADAAD.copy): Propagate the hashed length to the copy.
  t/: Add a test suite.
  ec.c: Don't lose error status when constructing points from a sequence.
  ec.c: Free partially constructed points coordinatewise.
  *.c: Be more careful about `PySequence_Size'.
  key.c: Reformat the rest of the `KeyError' constructor.
  key.c: Parse `KeyError' constructor arguments by hand.
  catacomb-python.h: Add a macro for raising `OverflowError'.
  key.c: Collect `KeyError' argument count as a separate step.
  key.c: Use tuple functions on `KeyError' argument tuple.
  ...

diff --cc algorithms.c
Simple merge

diff --cc catacomb-python.h
Simple merge

diff --cc catacomb.c
Simple merge

diff --cc debian/changelog
Simple merge

diff --cc debian/control
index 84a43a0,1bde721..7b7400d
--- 1/debian/control
--- 2/debian/control
+++ b/debian/control
@@@ -3,9 -3,9 +3,9 @@@ Section: pytho
  Priority: extra
  XS-Python-Version: >= 2.6, << 2.8
  Maintainer: Mark Wooding <mdw@distorted.org.uk>
- Build-Depends: debhelper (>= 10), pkg-config,
 -Build-Depends: debhelper (>= 9), dh-python, pkg-config,
++Build-Depends: debhelper (>= 10), dh-python, pkg-config,
        python (>= 2.6.6-3~), python-all-dev,
 -      mlib-dev (>= 2.2.2.1), catacomb-dev (>= 2.5.0)
 +      mlib-dev (>= 2.4.99~), catacomb-dev (>= 2.5.0)
  Standards-Version: 3.8.0
  
  Package: python-catacomb

diff --cc ec.c
Simple merge

diff --cc field.c
Simple merge

diff --cc group.c
Simple merge

diff --cc rand.c
Simple merge

diff --cc setup.py
Simple merge