New image for Surface_mesher intro and Pkg overview

.gitattributes

@@ -3846,6 +3846,8 @@ Surface_mesher/demo/Surface_mesher/windows/res/idb5.bmp -text svneol=unset#image
 Surface_mesher/demo/Surface_mesher/windows/res/idb6.bmp -text svneol=unset#image/bmp
 Surface_mesher/demo/Surface_mesher/windows/res/idb7.bmp -text svneol=unset#image/bmp
 Surface_mesher/demo/Surface_mesher/windows/res/idb8.bmp -text svneol=unset#image/bmp
+Surface_mesher/doc_tex/Surface_mesher/segmented_head.eps -text svneol=unset#application/postscript
+Surface_mesher/doc_tex/Surface_mesher/segmented_head.png -text svneol=unset#image/png
 Surface_mesher/doc_tex/Surface_mesher/skull-surface-small.png -text svneol=unset#image/png
 Surface_mesher/doc_tex/Surface_mesher/skull-surface.eps -text svneol=unset#application/postscript
 Surface_mesher/doc_tex/Surface_mesher/skull-surface.png -text svneol=unset#image/png

Surface_mesher/doc_tex/Surface_mesher/PkgDescription.tex

@@ -20,5 +20,5 @@ level set in a three-dimensional image.}
 %\ccPkgDependsOn{ }
 \ccPkgIntroducedInCGAL{3.2}
 \ccPkgLicense{\ccLicenseQPL}
-\ccPkgIllustration{Surface_mesher/skull-surface-small.png}{Surface_mesher/skull-surface.png}
+\ccPkgIllustration{Surface_mesher/segmented_head-small.png}{Surface_mesher/segmented_head.png}
 \end{ccPkgDescription}

Surface_mesher/doc_tex/Surface_mesher/main.tex

@@ -16,10 +16,10 @@
 
 \begin{center}
  \begin{ccTexOnly}
-   \includegraphics[height=10cm]{Surface_mesher/skull-surface}
+   \includegraphics[height=10cm]{Surface_mesher/segmented_head}
  \end{ccTexOnly}
  \begin{ccHtmlOnly}
-   <img border="0" src="./skull-surface.png" height="75%">
+   <img border="0" src="./segmented_head.png">
  \end{ccHtmlOnly}
 \end{center}
 
@@ -324,8 +324,7 @@ This parameter has a default which was used in the previous example.
 Also note that the center of the bounding sphere is required to be
 internal a point where the function has a negative value.
 
-The chosen iso-value of this 3D~image corresponds to a head skull. The
-resulting mesh is the introducing picture of this chapter.
+The chosen iso-value of this 3D~image corresponds to a head skull.
 
 \ccIncludeExampleCode{Surface_mesher/mesh_a_3d_gray_image.cpp}