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cleanup and formatting with a few clarifications

\label{Numerical_Response_Units}

Numerical Response problems can require units. In the problem editing form,
place the desired unit in the \textbf{Unit} field. A complete list of 
units is in the section \ref{Physical_Units}.
The computer will accept the answer in any of its accepted unit formats.
For example, if the answer to a problem is {}``1ft'', the computer will
accept {}``12in'' as correct.

Additional units can be defined using the ``customunits'' parameter, which is a comma-separated list of unit conversions. For example
\begin{verbatim}
peck=2*gallon,bushel=8*gallon,gallon=4.4*L
\end{verbatim}
would define the new units peck, bushel, and gallon. The last entry in a conversion chain always needs to be a unit that LON-CAPA already supports.