[doc] Add requirement for gettext and graphviz
When running the tutorial from scratch, I had errors because these
two packages were not installed.
.. _dataimport_module:
:mod:`cubicweb.dataimport`
==========================
.. automodule:: cubicweb.dataimport
Utilities
---------
.. autofunction:: count_lines
.. autofunction:: ucsvreader_pb
.. autofunction:: ucsvreader
.. autofunction:: callfunc_every
Object Stores
-------------
.. autoclass:: RQLObjectStore
:show-inheritance:
:members:
.. autoclass:: NoHookRQLObjectStore
:show-inheritance:
:members: