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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_Ternary_Operator}
The ?'s and :'s seen in the spreadsheet cells are part of compact notation for an if-then-else clause. Something like:

\texttt{( B2 > 16 ? 'passing grade' : 'failing grade')}

can be translated into:

\texttt{if (B2 > 16 ) \{ \\
  \hspace*{16pt}     \$temp = 'passing grade';\\
  \} else \{ \\
  \hspace*{16pt}     \$temp = 'failing grade'; \\
  \} \\
  \$temp;\\
}

The nicest part of the \texttt{( ? : )} operator (aside from its
compactness) is the way it automatically returns the value you want
without having to use any temporary variables.