Made OUTPUT_TEXT_DIRECTION option obsolete

src/config.xml

@@ -340,19 +340,6 @@ Go to the <a href="commands.html">next</a> section or return to the
       <value name='Ukrainian'/>
       <value name='Vietnamese'/>
     </option>
-    <option type='enum' id='OUTPUT_TEXT_DIRECTION' defval='None'>
-      <docs>
-<![CDATA[
- The \c OUTPUT_TEXT_DIRECTION tag is used to specify the direction in which all
- documentation generated by doxygen is written. Doxygen will use this
- information to generate all generated output in the proper direction.
-]]>
-      </docs>
-      <value name='None'/>
-      <value name='LTR'/>
-      <value name='RTL'/>
-      <value name='Context'/>
-    </option>
     <option type='bool' id='BRIEF_MEMBER_DESC' defval='1'>
       <docs>
 <![CDATA[
@@ -3895,5 +3882,6 @@ temporary files.
     <option type='obsolete' id='MSCGEN_PATH'/>
     <option type='obsolete' id='TCL_SUBST'/>
     <option type='obsolete' id='COLS_IN_ALPHA_INDEX'/>
+    <option type='obsolete' id='OUTPUT_TEXT_DIRECTION'/>
   </group>
 </doxygenconfig>