SF patch 876130: add C API to datetime module, from Anthony Tuininga.
The LaTeX is untested (well, so is the new API, for that matter).
Note that I also changed NULL to get spelled consistently in concrete.tex.
If that was a wrong thing to do, Fred should yell at me.
diff --git a/Misc/NEWS b/Misc/NEWS
index f2b65e6..b5038f7 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -559,6 +559,10 @@
C API
-----
+- Thanks to Anthony Tuininga, the datetime module now supplies a C API
+ containing type-check macros and constructors. See new docs in the
+ Python/C API Reference Manual for details.
+
- Private function _PyTime_DoubleToTimet added, to convert a Python
timestamp (C double) to platform time_t with some out-of-bounds
checking. Declared in new header file timefuncs.h. It would be