[rtags] Enhance repr of rtags
* we don't care of the class, the registry id is enough (never seen a case of
sub-classing)
* add the module from which the rtag is coming as well as parent rtag if any.
Tutorials
~~~~~~~~~
We present a few tutorials of different levels. The blog building
tutorial introduces one smoothly to the basic concepts.
Then there is a photo gallery construction tutorial which highlights
more advanced concepts such as unit tests, security settings,
migration scripts.
.. toctree::
:maxdepth: 1
base/index
advanced/index
tools/windmill.rst
textreports/index
dataimport/index