move manual to top-level directory, split out of debian-installer package

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diff --git a/da/using-d-i/modules/iso-scan.xml b/da/using-d-i/modules/iso-scan.xml
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+<!-- retain these comments for translator revision tracking -->
+<!-- original version: 18640 untranslated -->
+
+   <sect3 id="iso-scan">
+   <title>Looking for the Debian Installer ISO Image</title>
+<para>
+
+When installing via the <emphasis>hd-media</emphasis> method, there
+will be a moment where you need to find and mount the Debian Installer
+iso image in order to get the rest of the installation files. The
+component <command>iso-scan</command> does exactly this.
+
+</para><para>
+
+At first, <command>iso-scan</command> automatically mounts all block
+devices (e.g. partitions) which have some known filesystem on them and
+sequentially searches for filenames ending with
+<filename>.iso</filename> (or <filename>.ISO</filename> for that
+matter). Beware that the first attempt scans only files in the root
+directory and in the first level of subdirectories (i.e. it finds
+<filename>/<replaceable>whatever</replaceable>.iso</filename>,
+<filename>/data/<replaceable>whatever</replaceable>.iso</filename>,
+but not
+<filename>/data/tmp/<replaceable>whatever</replaceable>.iso</filename>).
+After an iso image has been found, <command>iso-scan</command> checks
+its content to determine if the image is valid Debian iso image or
+not. In the former case we are done, in the latter
+<command>iso-scan</command> seeks for another image.
+
+</para><para>
+
+In case the previous attempt to find an installer iso image fails,
+<command>iso-scan</command> will ask you whether you would like to
+perform more throughly search. This pass doesn't look only into the
+topmost directories, but really traverses whole filesystem.
+
+</para><para>
+
+If <command>iso-scan</command> does not discover your installer iso
+image, reboot back to your original operating system and check if the
+image has correct name (ending in <filename>.iso</filename>), if it is
+placed on a filesystem recognizable by &d-i;, and if it is not
+corrupted (verify the checksum). Experienced unix users could do this
+without rebooting on the second console.
+
+</para>
+   </sect3>