+ Split input-fields into two structures:
+ surflets/my-input-fields allows you to create your own input-fields.
(complete with structure surflets/input-field-value)
+ surflets/surflet-input-fields are the proposals for input-fields
from SUrflets. They support annotated input-fields where
appropriate (select, radio, checkbox, hidden) and changing of attributes,
e.g. default values. See test.scm for examples.
The interface of the structure SURFLETS has only changed slightly
concerning the input fields
(make-higher-input-field --> make-multi-input-field should be the
main change)
+ Adapt examples to new input-field interface
+ Note new structures in documentation.
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