Import upstream snapshot 80e710700aac9573a2230f74f7ce9e094833a0bc

Upstream: https://github.com/Rhoban/onshape-to-robot
Upstream-Commit: 80e710700aac9573a2230f74f7ce9e094833a0bc
Upstream-Branch: master

docs/source/processor_fixed_links.rst

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+Using fixed links
+=================
+
+Introduction
+------------
+
+If this processor is enabled, all parts will be separated in a link, associated with its parent using a ``fixed`` link.
+
+.. note::
+
+    Doing this is likely to result in poor performance in physics engine, but can be useful for debugging.
+
+``config.json`` entries
+-----------------------
+
+.. code-block:: javascript
+
+    {
+        // ...
+        // General import options (see config.json documentation)
+        // ...
+
+        // Adding fixed links, resulting in one link per part
+        "use_fixed_links": true
+    }
+
+``use_fixed_links`` *(default: false)*
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+If set to ``true``, a dummy base link will be added to the robot. 
+
+Alternatively, ``use_fixed_links`` can be a list of the links for which you want the fixed links to be added.