The help window displays "doc.txt" from the collection specified by coll-path.
The frame-title argument is used for the help window title.
If verbatim? is true, then "doc.txt" is displayed verbatim, otherwise it is formatted as follows:
Any line of the form **....** is omitted.
Any line that starts with * after whitespace is indented as a bullet point.
Any line that contains only -s and is as long as the previous line causes the previous line to be formatted as a title.
Other lines are paragraph-flowed to fit the window.