implement mime exceptions to "use desktop open" so that we can use evince and pass page and search string parameters for pdf,ps and dvi even when all other mime types are passed to xdg-open

src/doc/user/usermanual.sgml

@@ -502,6 +502,20 @@ recoll
         described in the <link linkend="rcl.install.external">external
           packages section.</link></para>
 
+
+
+      <sect2 id="rcl.indexing.config.sens">
+        <title>Index case and diacritics sensitivity</title>
+
+        <para>Index case sensitivity
+          is controlled by the <i>indexStripChars</i> configuration
+          variable which can only be changed by editing the
+          configuration file. Any change implies an index reset (not
+          automated by recoll), and all indexes in a search must be set
+          in the same way (again, not checked by recoll). </para>
+
+
+
       <sect2 id="rcl.indexing.config.gui">
         <title>The indexing configuration GUI</title>
 
@@ -4040,6 +4054,17 @@ skippedPaths = ~/somedir/&lowast;.txt
 
         <variablelist>
 
+          <varlistentry><term><varname>indexStripChars</varname></term>
+            <listitem><para>Decide if we strip characters of diacritics and
+                convert them to lower-case before terms are indexed. If we
+                don't, searches sensitive to case and diacritics can be
+                performed, but the index will be bigger, and some marginal
+                weirdness may sometimes occur. The default is a stripped
+                index (<literal>indexStripChars = 1</literal> for
+                now.</para> 
+            </listitem>
+          </varlistentry>
+
           <varlistentry><term><varname>nonumbers</varname></term>
             <listitem><para>If this set to true, no terms will be generated
             for numbers. For example "123", "1.5e6", 192.168.1.4, would not
@@ -4228,6 +4253,26 @@ unac_except_trans =
 
 	 <variablelist>
 
+          <varlistentry><term><varname>autodiacsens</varname></term>
+            <listitem><para>IF the index is not stripped, decide if we
+                automatically trigger diacritics sensitivity if the search
+                term has accented characters (not in
+                <literal>unac_except_trans</literal>). Else you need to use
+                the query language and the <literal>D</literal> modifier to
+                specify diacritics sensitivity. Default is no.</para>
+            </listitem>
+          </varlistentry>
+
+          <varlistentry><term><varname>autocasesens</varname></term>
+            <listitem><para>IF the index is not stripped, decide if we
+                automatically trigger character case sensitivity if the
+                search term has upper-case characters in any but the first
+                position. Else you need to use the query language and the
+                <literal>C</literal> modifier to specify character-case
+                sensitivity. Default is yes.</para>
+            </listitem>
+          </varlistentry>
+
           <varlistentry><term><varname>loglevel,daemloglevel</varname></term>
             <listitem><para>Verbosity level for recoll and
             recollindex. A value of 4 lists quite a lot of
@@ -4246,7 +4291,6 @@ unac_except_trans =
             </listitem>
           </varlistentry>
 
-
           <varlistentry><term><varname>mondelaypatterns</varname></term>
             <listitem><para>This allows specify wildcard path patterns
             (processed with fnmatch(3) with 0 flag), to match files which