Let the user show/hide fieldsets in a form

[Gregory Vincic]

This would be a way for developers to hide advanced fields by default.

[Gregory Vincic]

(In [3894]) Fixes #711. Use method fieldset.setOpen(false) to hide the fieldset.

[Gregory Vincic]

(In [3896]) Refs #711. Added rule that if there is only one fieldset in a form the toggling feature should be ignored.

[Gregory Vincic]

(In [3905]) Refs #711. Using + and - icons for fieldset toggling.

[Gregory Vincic]

(In [3908]) Refs #711. Added feature to use nested fieldsets within forms. These fieldsets may however not be shown or hidden.

[olle]

Design update:

• The rule that the toggling feature is ignored for forms with only one field set makes sense in most cases, except when other GUI elements like TitledWindow also exist. In order to allow the show/hide toggle feature for a single field set when appropriate, class Fieldset will be updated with a new private instance variable Boolean singleFieldsetToggleAllowed with public accessor methods. The default value of singleFieldsetToggleAllowed will be false, and will therefore not change the appearance of forms if not specifically called for.

[olle]

(In [4090]) Refs #711. Refs #668. Field set show/hide toggle updated to allow the feature for single field sets, if specifically called for:

1. Class/file gui/form/Fieldset.java in client/servlet/ updated with new private instance variable Boolean singleFieldsetToggleAllowed with public accessor methods. The default value of singleFieldsetToggleAllowed is false, and will therefore not change the appearance of forms if not specifically called for.

2. Class/file gui/web/GUIConverter.java in client/servlet/ updated in public method Tag convert(org.proteios.gui.form.Form w) to allow the show/hide toggle feature for a single field set, if value of singleFieldsetToggleAllowed is true.