On submit succes, if we don't navigate away from page, apply possible form updates, as received from the server.

tablesorter.html: does now feature grouping.

QfqForm.js: Form refresh is now known as form update. Form updates receive more elaborate response from server.

Dropped extension/Documentation/_make/build.

Added bla.

See merge request !1

Radio.
BuildFormBootstrap: rendering standard class removed.
Constants: defined SYSTEM_CSS_CLASS_CONTAINER

Documentation/index.rst: Version number increased to 0.2, added RO as Author (accidently removed,
BodyTextParser: implemented for 'join' and 'nested'

Refactored Element.js, i.e. deleted it, since it has been degenerated to a proxy object, with no added value.

Added QfqNS.Element.getElement() function. Elements can now be set readonly/disabled. Renamed QfqNS.Element.Input to QfqNS.Element.Text.