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/api/detachinterrupt.rst b/docs/source/lang/api/detachinterrupt.rst
new file mode 100644
index 0000000..6eb8e53
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+++ b/docs/source/lang/api/detachinterrupt.rst
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+.. _lang-detachinterrupt:
+
+detachInterrupt()
+=================
+
+Used to disable an interrupt specified with
+:ref:`lang-attachinterrupt`\ .
+
+Library Documentation
+---------------------
+
+.. FIXME [Breathe] once we can get the correct detachInterrupt(),
+.. replace with doxygenfunction.
+
+.. cpp:function:: void detachInterrupt(uint8 pin)
+
+   Disable any registered external interrupt on the given pin.
+
+   *Parameters*
+
+       - ``pin`` Maple pin number
+
+Arduino Compatibility
+---------------------
+
+There is one important difference between the Maple version of
+detachInterrupt and the Arduino version.  On the Maple, the argument
+to ``detachInterrupt()`` is the *pin* on which the interrupt is
+attached, while on the Arduino, the argument is the *interrupt
+number*, which is different from the pin the interrupt is enabled on.
+
+If you're calling this function, you've already called
+:ref:`lang-attachinterrupt` to set up your interrupt handler, so
+just call ``detachInterrupt()`` with the same pin argument you gave to
+``attachInterrupt()``.
+
+See Also
+--------
+
+- :ref:`attachInterrupt() <lang-attachInterrupt>`
+- :ref:`external-interrupts`
+
+.. include:: /arduino-cc-attribution.txt