Generates the html needed to include a popup reference note.
Note requires inclusion of javascript libraries for this to function.
Usage
refNote(text = "This is a test note", number = "*")
Value
The html for the popup note
Arguments
text
Note to include in popup. Line breaks occasionally cause problems.
As this is generally for short notes; I have not come up with
a general solution yet.
If your note text is complicated, ensure that you check the result.
number
The label to identify the note in the text.
Author
Mark Peterson
References
This was based on the popups on the https://what-if.xkcd.com/ site