[autoform] Go through guess_field even when field class is specified using uicfg
guess_field does not only find the proper field class for some
attribute/relation, but also do some basic configuration depending on e.g.
constraints. Before this patch, if one was specifying explicitly the field class
using uicfg.autoform_field, this automatic configuration wasn't happening.
Change form.field_by_name and ff.guess_field so explicit class are also
automatically configured now.
Closes #14474840
Web side development
====================
In this chapter, we will describe the core APIs for web development in
the *CubicWeb* framework.
.. toctree::
:maxdepth: 2
publisher
controllers
request
searchbar
views/index
rtags
ajax
js
css
edition/index
facets
internationalization
property
httpcaching
resource