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FAQ, Hints, Todos, Troubleshooting, Bugs
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All todo items are in the sections they semantically belong to;
this just brings them all together.

All todo items are prefixed:

======== ===============================================
Prefix   Meaning
======== ===============================================
FAQ      Frequently asked question.
DOC      Hint to documentation missing.
BUG      A known bug.
FEATURE  A not-implemented feature that is most likely to come.
IDEA     A not-implemented feature idea.
======== ===============================================

.. todolist::
