buttons return the coordinates where the user clicked à la
imgbtn321.x=13&imgbtn321.y=12. Thus, we cannot search for the
input-field-name of the image button. To remove this bug, we introduce
following changes:
surflet-input-fields.scm:
+ make-image-button returns a multi-input-field that searches for its
coordinates in the bindings, returning a pair (x y) of it (numbers).
+ Adapt select-input-fields to interface changes of multi-input-fields:
transformers get also their input-fields.
returned-via.scm:
Don't simply check for the input field name in the binding. Use
input-field-value to check for existance of the input field in the
bindings
input-fields.scm:
multi-input-fields get also their input-field as argument
web-server/root/surflets/byte-input.scm:
Adapt to interface change of multi-input-fields: transformers get also
their input-field
web-server/root/surflets/test.scm:
Check the image-button feature correctly.
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