------------------
Bug fixes:
- Call ``processForm`` with ``{None: None}`` dict as values.
This prevents ``processForm`` using ``REQUEST.form`` and overwriting
values already set by ``invokeFactory``.
Fixes `issue 99 <https://github.com/plone/plone.api/issues/99>`_.
[david-batranu]
- Simplification/minor speedup:
Permissions checks now directly use AccessControl.
Technical its now exact the same as before.
Before a tool lookup was needed, calling a utility function, calling AccessControl.
[jensens]