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New spreadsheet help files.

\label{Spreadsheet_HowTo_Assessments} \textbf{How to deal with multi-part problems} Often, there are several parts in a specific problem. For example, a problem with three parts would have parts 0, 11, 12, and 13. For a general spreadsheet, it is not often desirable to sum up all of these parts, while not knowing how many parts there are as the spreadsheet is written. The spreadsheet has a preprocessor which an expand a symbolic expression over all symbolic names that fit. The general syntax is \index{EXPANDSUM} \texttt{[\&EXPANDSUM(VARNAME;expression)]}. For example, for the above assessment with three parts, \texttt{\&EXPANDSUM(}\texttt{\textbf{PART}}\texttt{;parameter\_}\texttt{\textbf{PART}}\texttt{\_weight{*}stores\_}\texttt{\textbf{PART}}\texttt{\_awarded)} would become \texttt{parameter\_0\_weight{*}stores\_0\_awarded +}~\\ \texttt{parameter\_11\_weight{*}stores\_11\_awarded +}~\\ \texttt{parameter\_12\_weight{*}stores\_12\_awarded +}~\\ \texttt{parameter\_13\_weight{*}stores\_13\_awarded +}~\\ where \textbf{bolded text} is used to highlight what the \texttt{\&EXPANDSUM} function is doing. \textbf{What 'tries' means} In multi-part questions, the exported value for "tries"\index{tries} is now the average number of tries to get the parts right. The full data for each part is still stored by the system.