merge libmaple docs ("leaflabs-docs") into ./docs

In the past, libample documentation was forked out of this repository
because the documentation had increased in scope. For the librambutan,
and the rambutan project in general, we will try to keep documentation
closer to the source code, so the librambutan-specific documentation
should live here. Other sections of leaflabs-docs will be culled in a
following commit.

This merge attempts to maintain history by using a subtree strategy.
Followed directions at:

    http://nuclearsquid.com/writings/subtree-merging-and-you/

Full history for files should be accessible using the "--follow" flag to
git log, eg:

    git log --follow docs/source/adc.rst

It should be possible to pull patches from leaflabs-docs with:

    git pull -s subtree leaflabs-docs master

... at least until the docs in this repository diverge significantly.

1 files changed, 43 insertions, 0 deletions

diff --git a/docs/source/lang/cpp/unsignedlonglong.rst b/docs/source/lang/cpp/unsignedlonglong.rst
new file mode 100644
index 0000000..a1143f0
--- /dev/null
+++ b/docs/source/lang/cpp/unsignedlonglong.rst
@@ -0,0 +1,43 @@
+.. highlight:: cpp
+
+.. _lang-unsignedlonglong:
+
+``unsigned long long``
+======================
+
+An unsigned version of the :ref:`long long <lang-longlong>` data type.
+An ``unsigned long long`` occupies 8 bytes of memory; it stores an
+integer from 0 to 2^64-1, which is approximately 1.8×10^19 (18
+quintillion, or 18 billion billion).
+
+A synonym for the ``unsigned long long`` type is ``uint64``.
+
+Like an :ref:`unsigned int <lang-unsignedint>`, an ``unsigned long
+long`` won't store negative numbers; it is also subject to the same
+:ref:`overflow issues <lang-int-overflow>` as any integral data type.
+
+Here is an example of declaring an ``unsigned long long`` variable
+named ``c``, then giving it value 299,792,458,000,000,000 (see
+:ref:`integer constants <lang-constants-integers-u-l>` for an
+explanation of the "ULL" at the end of the number)::
+
+        // Speed of light in nanometers per second (approximate).
+        unsigned long long c = 299792458000000000ULL;
+
+The general syntax for declaring an ``unsigned long long`` variable named
+``var``, then giving it value ``val``, looks like::
+
+        unsigned long long var = val;
+
+See Also
+--------
+
+- :ref:`long long <lang-longlong>`
+- :ref:`int <lang-int>`
+- :ref:`unsigned <lang-unsignedint>`
+- :ref:`char <lang-char>`
+- :ref:`unsigned char <lang-unsignedchar>`
+- :ref:`Integer Constants <lang-constants-integers>`
+- :ref:`Variables <lang-variables>`
+
+.. include:: /arduino-cc-attribution.txt