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.tex files from help.loncapa.org largely done. Added some lables to
older files. Last mega-massive .tex commit for a while.

\label{Spreadsheet_Functions}
The following functions are available in the spreadsheet:

\begin{itemize}

\item \texttt{\&NUM(range)} - number of non-empty cells in range

\item \texttt{\&BIN(low, high, range)} - number of non-empty cells in
  range with values between low and high

\item \texttt{\&SUM(range)} - sum of the non-empty cells in range

\item \texttt{\&MEAN(range)} - mean value of non-empty cells in range

\item \texttt{\&STDDEV(range)} - standard deviation of non-empty cells
  in range 

\item \texttt{\&PROD(range)} - product of non-empty cells in range

\item \texttt{\&MAX(range)} - maximum value of non-empty cell in range

\item \texttt{\&MIN(range)} - minimum value of non-empty cells in
  range 

\item \texttt{\&SUMMAX(n ,range)} - sum of the maximum n non-empty
  cells in range

\item \texttt{\&SUMMIN(n, range)} - sum of the minimum n non-empty
  cells in range

\item \texttt{\&EXT(expression)} - access to EXT function in lonnet

\end{itemize}

In addition, non-IO Perl functions work in cells, which is internally
evaluated within a safe space. Field names and Column-Row combinations
can be used as variables.