Remove references to --xyz option in point2dem

I have removed it from the executable.

docs/book/tools.tex

@@ -134,7 +134,7 @@ \section{point2dem}
 The \texttt{point2dem} program produces a GeoTIFF terrain model or an orthographic image from a point cloud image produced by the {\tt stereo} command.
 
 Example:\\
-\hspace*{2em}\texttt{point2dem \textit{output-prefix}-PC.tif -o stereo/filename -\/-xyz -r moon $\backslash$} \\
+\hspace*{2em}\texttt{point2dem \textit{output-prefix}-PC.tif -o stereo/filename -r moon $\backslash$} \\
 \hspace*{4em}\texttt{-\/-default-value -10000 -n}
 
 This produces a digital elevation model that has been referenced to
@@ -148,7 +148,7 @@ \section{point2dem}
 for debugging.
 
 Another example: \\
-\hspace*{2em}\texttt{point2dem \textit{output-prefix}-PC.tif -o stereo/filename -\/-xyz -r moon $\backslash$} \\
+\hspace*{2em}\texttt{point2dem \textit{output-prefix}-PC.tif -o stereo/filename -r moon $\backslash$} \\
 \hspace*{4em}\texttt{-\/-orthoimage \textit{output-prefix}-L.tif}
 
 This command takes the left input image and orthographically projects
@@ -177,7 +177,6 @@ \section{point2dem}
 \texttt{-\/-texture-file \textit{texture-file}} & Explicitly specify the texture file \\ \hline
 \texttt{-\/-output-prefix|-o \textit{output-prefix}} & Specify the output prefix \\ \hline
 \texttt{-\/-output-filetype|-t \textit{type(=tif)}} & Specify the output file type \\ \hline
-\texttt{-\/-xyz-to-lonlat} & Convert from XYZ coordinates to longitude, latitude, altitude coordinates \\ \hline
 \texttt{-\/-reference-spheroid|-r moon|mars} & Set a reference surface to a hard coded value. This will override manually set datum information. \\ \hline
 \texttt{-\/-semi-major-axis \textit{float(=0)}} & Set the dimensions of the datum in meters\\ \hline
 \texttt{-\/-semi-minor-axis \textit{float(=0)}} & Set the dimensions of the datum in meters\\ \hline

docs/book/tutorial.tex

@@ -538,21 +538,17 @@ \subsection{Building a Digital Elevation Model}
 \ac{DEM} from the point cloud file.
 
 \begin{verbatim}
-    ISIS 3> point2dem --xyz-to-lonlat E0201461-M0100115-PC.tif
+    ISIS 3> point2dem E0201461-M0100115-PC.tif
 \end{verbatim}
 
 \noindent
 The resulting TIFF file is map projected and will contain
-georeferencing information stored as GeoTIFF tags.  The
-\texttt{-\/-xyz-to-lonlat} option is {\em required} in most common uses, as
-it transforms the results from a Cartesian, body-centered coordinate
-system to the longitude, latitude, altitude spherical coordinate
-system.  You can specify a coordinate system (e.g., mercator,
-sinusoidal) and a reference spheroid (i.e., calculated for the Moon or
-Mars).
+georeferencing information stored as GeoTIFF tags. You can specify a
+coordinate system (e.g., mercator, sinusoidal) and a reference
+spheroid (i.e., calculated for the Moon or Mars).
 
 \begin{verbatim}
-    ISIS 3> point2dem --xyz-to-lonlat -r mars E0201461-M0100115-PC.tif
+    ISIS 3> point2dem -r mars E0201461-M0100115-PC.tif
 \end{verbatim}
 
 \noindent
@@ -568,7 +564,7 @@ \subsection{Building a Digital Elevation Model}
 to use for the projection:
 
 \begin{verbatim}
-    ISIS 3> point2dem --xyz-to-lonlat -r mars --orthoimage E0201461-M0100115-L.tif \
+    ISIS 3> point2dem -r mars --orthoimage E0201461-M0100115-L.tif \
         E0201461-M0100115-PC.tif
 \end{verbatim}