Christmas Bird Count history report system

This is the form of the value returned by et.CLASS(). We also use it for combining CSS class names from multiple sources: see Section 59, “combineCss(): Combine CSS classes from different sources”.

#----------------------------------------------------------------
# class-dict ==
#   a dictionary with one entry whose key is 'class' and the
#   related value is a string containing one or more CSS class
#   names separated by spaces