Merge branch 'release/2.2.0' into develop
TODO
Metadata fixups, tw2.core#90
Nearly fix test suite
Completely fix tests - woohoo
2.5, are you kidding?
Fix tests on Python3
Fix spacing in input-append
Simply always use ISO-6801 date format string

This fixes #15 and fixes #14 (specifying invalid directives would simply
be a user fault in the future).
Code style improvements and fixing #16
Add container ids to all layout widgets

Required for compatibility with tw2.dynforms hiding stuff.

Fixes #17.
Fix test case

Related to
toscawidgets/tw2.forms@54e0ac753f409c881321218e5bfdac03f4d9312a
Version bump
Merge branch 'release/2.2.2'