OpenACS

- Page->content_header_append/content_header_get: new methods to

 include HTML content before the form.  One use case ist to include

 additional forms this way, since these cannot be included in the

 main form of a FormPage. The additional content is displayed in the

 www-view method.

- FormPage->create_form_fields_from_names: new convenience function to create

 form-fields via their names. The definitions of the named form-fields are

 taken from the provided form_constraints. This function is useful when

 only a subset of the form-constraints definitions should be used

 to create form-fields.

- improve comments

- improve argument checking on parent_id to be able to provide better

 error messages

- reduce usage of regexp for performance reasons

- improve spelling

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