OpenACS

- Provide statitics for autograded exams and show this (currently for

 MC/SC) in the exam summary.  The statistics are generated when the

 exam-protocol is rendered and persisted statistics in the workflow

 instance.

- Added switch "-generic" to answer_form_field_objs to obtain the

 question with all alternatives (not constraint to "show_max") and

 without shuffling. This is needed in cases, where e.g. statistics

 should be provided for all alternatives shown to all students.

- Question_manager->question_info: separate computation from HTML rendering

- Added statistics handler for the WorkflowPage class to collect

 details from the form-fields.

- new private function "tdom_render" (might be useful, but is the

 committed version not used)

- split out "spec_to_dict" from "fc_to_dict", since it us also useful on its own

 to work on single form-constraint specs.

- make methods add_to_fc and replace_in_fc available to the full AssessmentInterface

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