[form renderers] closes #1787232: new 'onerowtable' form renderer
so it's easy to retrieve a dictionary of {field name : typed value} for a custom,
no entity related, form
debian/tmp/usr/lib/PY_VERSION/site-packages/cubicweb/web usr/lib/PY_VERSION/site-packages/cubicweb
debian/tmp/usr/share/cubicweb/cubes/shared/data usr/share/cubicweb/cubes/shared
debian/tmp/usr/share/cubicweb/cubes/shared/wdoc usr/share/cubicweb/cubes/shared