debian/HOWTO: How to make .deb package.

Signed-off-by: Roland Levillain <roland@lrde.epita.fr>

ChangeLog

+2011-12-02  Guillaume Lazzara  <z@lrde.epita.fr>
+
+	* debian/HOWTO: How to make .deb package.
+
 2011-12-02  Guillaume Lazzara  <z@lrde.epita.fr>
 
 	Add package description files for .deb generation.

debian/HOWTO

+Use the following command:
+-------------------------
+
+git-buildpackage --git-export-dir=../build-area/  --git-builder="debuild --preserve-env --prepend-path=/usr/local/bin -i'\.git' -I.git "
+
+
+
+--preserve-env should NOT be used. However we enable this option to
+  use ccache while compiling.
+
+--prepend-path allows us to use a more recent version of Doxygen
+  located in /usr/local/bin.
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