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Thomas De Schampheleire

setup: bump formencode minimum version to 1.3.0

The formencode version range included both 1.2.x and 1.3.x releases.
However, since 1.3.0, _to_python and validate_python are deprecated and
renamed to _convert_to_python and _validate_python, respectively.

With current pytest, these (long) deprecation warnings are shown in the test
logs.

There are two options:
- restrict maximum version to 1.2.x
- bump minimum version to 1.3.x

In this commit we choose the latter approach, going towards the future
rather than the past.

.. _debugging:

===================
Debugging Kallithea
===================

If you encounter problems with Kallithea, here are some instructions
on how to debug them.

.. note:: First make sure you're using the latest version available.


Enable detailed debug
---------------------

Kallithea uses the standard Python ``logging`` module to log its output.
By default only loggers with ``INFO`` level are displayed. To enable full output
change ``level = DEBUG`` for all logging handlers in the currently used .ini file.
This change will allow you to see much more detailed output in the log file or
console. This generally helps a lot to track issues.


Enable interactive debug mode
-----------------------------

To enable interactive debug mode simply comment out ``set debug = false`` in
the .ini file. This will trigger an interactive debugger each time
there is an error in the browser, or send a http link if an error occurred in the backend. This
is a great tool for fast debugging as you get a handy Python console right
in the web view.

.. warning:: NEVER ENABLE THIS ON PRODUCTION! The interactive console
             can be a serious security threat to your system.