Switch to unified view

a/src/doc/user/usermanual.sgml b/src/doc/user/usermanual.sgml
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       by side. (You can also browse successive results in a single
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       by side. (You can also browse successive results in a single
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       preview window by typing
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       preview window by typing
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       <keycap>Shift</keycap>+<keycap>ArrowUp/Down</keycap> in the
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       <keycap>Shift</keycap>+<keycap>ArrowUp/Down</keycap> in the
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       window).</para> 
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       window).</para> 
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      <para>Clicking the <literal>Open</literal> link will attempt to 
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      <para>Clicking the <literal>Open</literal> link will
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       start an external viewer. The viewer for each document type can be
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       start an external viewer for the document. By default, &RCL; lets
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       configured through the user preferences dialog, or by editing the
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       the desktop choose the appropriate application for most document
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       <filename>mimeview</filename> configuration file. You can also check
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       types (there is a short list of exceptions, see further). If you
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       prefer to completely customize the choice of applications, you can
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       the <guilabel>Use desktop preferences</guilabel> option in the GUI
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       uncheck the <guilabel>Use desktop preferences</guilabel> option in
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       preferences dialog to use the desktop defaults for all
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       the GUI preferences dialog, and click the <guilabel>Choose editor
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       documents. This is probably the best option if you are using a well
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       applications</guilabel> button to adjust the predefined &RCL;
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       configured <application>Gnome</application> or 
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       choices. The tool accepts multiple selections of mime types (e.g. to
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       <application>KDE</application> desktop.</para>
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       set up the editor for the dozens of office file types).</para>
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        <para>Even when <guilabel>Use desktop preferences</guilabel> is
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        checked, there is a small list of exceptions, for mime types where
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        the &RCL; choice should override the desktop one. These are
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        applications which are well integrated with &RCL;, especially
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        <application>evince</application> for viewing PDF and Postscript
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        files because of its support for opening the document at a specific
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        page and passing a search string as an argument. Of course, you can
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        edit the list (in the GUI preferences) if you would prefer to lose
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        the functionality and use the standard desktop tool.</para>
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        <para>You may also change the choice of applications by editing the
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       <link linkend="rcl.install.config.mimeview">
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       <filename>mimeview</filename></link> configuration file if you find
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       this more convenient.</para>
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      <para>The <literal>Preview</literal> and <literal>Open</literal>
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      <para>The <literal>Preview</literal> and <literal>Open</literal>
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       edit links may not be present for all entries, meaning that
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       edit links may not be present for all entries, meaning that
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       &RCL; has no configured way to preview a given file type (which
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       &RCL; has no configured way to preview a given file type (which
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       was indexed by name only), or no configured external editor for
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       was indexed by name only), or no configured external editor for