-Titlecase terms, uppercase abbreviations, avoid jargons, add titles to empty title forms....

* it is faster.
* it does not require Products.

Allow client side to specify how it want server to return listbox field - i.e. it can be rendered locally or rendered entirely server side.

Fixes copy-paste of DateTimeField rendering into search expression, as it
separates time from date with 3 spaces.

Original code behaviour:
>>> def foo(self, a=None):
...    return 'works'
...
>>> context.foo(a=1)
works
>>> def foo(self, a):
...   return 'works'
...
>>> context.foo(1)
works
>>> context.foo(a=1)
TypeError: foo() takes exactly 2 non-keyword arguments (0 given)

New behaviour fixes this TypeError, to be closer to normal python
behaviour.
Also, original code was doing expensive checks before cheap ones.

Also, use from ... import * to make verbatim original code work.
Also, use original code's coding style for unaltered lines.

For easier copy/paste from original file.