ADD: 'Built-in file viewer' as viewer.html. ADD: viewer*.png. (doublecmd#41)

ADD: 'Synchronize directories' as syncdirs.html. ADD: syncdirs*.png.
ADD: about.html: root privileges.
ADD: configuration.html: Section 'Tools': Add all subsections. Add pic(50-54).png.
ADD: configuration.html: Section 'Quick search/filter': Note about pinyin support.
ADD: copymove.html: Usung file mask to change target names. 'Name collisions'.
ADD: help.html: cm_OpenVirtualFileSystemList: Virtual folders 'Recycle Bin' and 'Network'.
ADD: help.html: 'Drives button bar': 'Open VFS list'.
ADD: cmds.html: cm_CompareContents: The 'dir' parameter.
UPD: configuration.html: Section 'File operations': 'BufferSize' desc.
UPD: configuration.html: Section 'Mouse > Drag & drop': More detailed desc.
UPD: faq.html: 1.6: Add link to #117.
UPD: help.html: Description of some functions: 'Create Directory', 'Compare by Contents', 'Quick View Panel'.
UPD: multirename.html: 'Find and replace' desc. The structure of this page has been slightly changed.
CHG: Using 'directory separator'.
CHG: doublecmd.css: Style for the DC version label.
FIX: Replace 'Mac OS' with 'macOS' and '—' with '–'.
FIX: cmds.html: cm_OpenVirtualFileSystemList: Description.
FIX: configxml.html: SyncDirs/Colors/Unknown.
Other small fixes/changes.

Author: Skif-off

doc/en/about.html

@@ -38,6 +38,7 @@ <h2><a name="presentation">1. Presentation</a></h2>
           <li><p>extended search function with full text search in any files</p></li>
           <li><p>multiple files name <a href="multirename.html">rename</a> at once</p></li>
           <li><p>directory synchronization</p></li>
+          <li><p>request administrator/root privileges for file operations (if necessary)</p></li>
           <li><p>customizable columns</p></li>
           <li><p>built-in file viewer (<kbd>F3</kbd>) to view files of ANY SIZE in hexadecimal, binary or text format</p></li>
           <li><p>built-in text editor (<kbd>F4</kbd>) with syntax highlighting</p></li>

doc/en/cmds.html

@@ -16,7 +16,7 @@
 
     <div class="dchelpage">
       <div>
-        <h1>2.11. Internal Commands</h1>
+        <h1>2.13. Internal Commands</h1>
       </div>
 
       <div>
@@ -232,7 +232,7 @@ <h2><a name="catactivepanel">2.1. Active Panel</a></h2>
             <td class="cmdcell"><img class="IntCmdImage" title="cm_QuickView" alt="cm_QuickView" src="../../pixmaps/dctheme/32x32/actions/cm_quickview.png">
               <div class="cmdname"><a name="cm_QuickView">cm_QuickView</a></div>
               <div class="shrtctkey">Ctrl+Q</div></td>
-            <td class="cmdhintcell">Content of selected item shown in opposite panel.<br>As we navigate to next items, displayed content is updated.</td>
+            <td class="cmdhintcell">Content of selected item shown in opposite panel (instead of a separate window).<br>As we navigate to next items, displayed content is updated.</td>
           </tr>
           <tr>
             <td class="cmdcell"><img class="IntCmdImage" title="cm_SortByName" alt="cm_SortByName" src="../../pixmaps/dctheme/32x32/actions/cm_sortbyname.png">
@@ -344,7 +344,7 @@ <h2><a name="catactivepanel">2.1. Active Panel</a></h2>
                 </tr>
               </table>
               <br>
-              Example: "cm_UniversalSingleDirectSort: panel=active, column=size, order=descending"<br>This will sort the item in active by column according to size&nbsp;&mdash; larger files first.
+              Example: "cm_UniversalSingleDirectSort: panel=active, column=size, order=descending"<br>This will sort the item in active by column according to size&nbsp;&ndash; larger files first.
             </td>
           </tr>
           <tr>
@@ -755,7 +755,7 @@ <h2><a name="catfileoperations">2.4. File Operations</a></h2>
           <tr>
             <td class="cmdcell"><img class="IntCmdImage" title="cm_OpenVirtualFileSystemList" alt="cm_OpenVirtualFileSystemList" src="../../pixmaps/dctheme/32x32/actions/cm_openvirtualfilesystemlist.png">
               <div class="cmdname"><a name="cm_OpenVirtualFileSystemList">cm_OpenVirtualFileSystemList</a></div></td>
-            <td class="cmdhintcell">Open according to WFX plugin.</td>
+            <td class="cmdhintcell"><a href="help.html#cm_OpenVirtualFileSystemList">Open VFS list</a>.</td>
           </tr>
           <tr>
             <td class="cmdcell"><img class="IntCmdImage" title="cm_FileProperties" alt="cm_FileProperties" src="../../pixmaps/dctheme/32x32/actions/cm_fileproperties.png">
@@ -2019,7 +2019,7 @@ <h2><a name="catwindow">2.12. Window</a></h2>
           <tr>
             <td class="cmdcell"><img class="IntCmdImage" title="cm_PanelsSplitterPerPos" alt="cm_PanelsSplitterPerPos" src="../../pixmaps/dctheme/32x32/actions/cm_panelssplitterperpos.png">
               <div class="cmdname"><a name="cm_PanelsSplitterPerPos">cm_PanelsSplitterPerPos</a></div></td>
-            <td class="cmdhintcell">Set the panels width, e.g. 50%&nbsp;&mdash; equal size.<br>
+            <td class="cmdhintcell">Set the panels width, e.g. 50%&nbsp;&ndash; equal size.<br>
               <br>
               <table class="innercmddesc">
                 <tr class="rowinnerdesc">
@@ -2321,7 +2321,10 @@ <h2><a name="cattools">2.14. Tools</a></h2>
           <tr>
             <td class="cmdcell"><img class="IntCmdImage" title="cm_CompareContents" alt="cm_CompareContents" src="../../pixmaps/dctheme/32x32/actions/cm_comparecontents.png">
               <div class="cmdname"><a name="cm_CompareContents">cm_CompareContents</a></div></td>
-            <td class="cmdhintcell">Open <a href="help.html#cm_CompareContents">compare by contents</a> dialog</td>
+            <td class="cmdhintcell">
+              Open <a href="help.html#cm_CompareContents">compare by contents</a> dialog.<br>
+              If an external diff program is used, the "dir" parameter (without quotes) is available: in this case, the current directories of the left and right file panels will be passed to the program.
+            </td>
           </tr>
           <tr>
             <td class="cmdcell"><img class="IntCmdImage" title="cm_DebugShowCommandParameters" alt="cm_DebugShowCommandParameters" src="../../pixmaps/dctheme/32x32/actions/cm_debugshowcommandparameters.png">

doc/en/commandline.html

@@ -16,7 +16,7 @@
 
     <div class="dchelpage">
       <div>
-        <h1>2.14. Command line</h1>
+        <h1>2.16. Command line</h1>
       </div>
 
       <div>