CC-2977: Never delete files from the database

- Files are marked deleted(file_exists to false) on deletion.
- Dirs are marked removed(removed flag to true) on removal of watched
folder in a usual way. If dir is unmounted, without being removed from
watched list first, it will be marked as not exists(exist flag to false)
- Manage Media Folders will show if dirs exist or not( mounted or not)
- Playlist builder will show if files exists or not

airtime_mvc/application/views/scripts/form/preferences_watched_dirs.phtml

@@ -33,12 +33,12 @@
                 </ul>
             <?php endif; ?>
         </dd>
-        <?php $watched_dirs = Application_Model_MusicDir::getWatchedDirs(); ?>
+        <?php $watched_dirs = Application_Model_MusicDir::getWatchedDirs(null, false); ?>
 
         <?php if (count($watched_dirs) > 0): ?>
             <?php foreach($watched_dirs as $watched_dir): ?>
                 <dd class="block-display selected-item">
-                    <span><?php echo $watched_dir->getDirectory(); ?></span><span class="ui-icon ui-icon-close"></span>
+                    <span><?php echo $watched_dir->getDirectory(); echo " -- Exsits? "; echo ($watched_dir->getExistsFlag())?"YES":"NO";?></span><span class="ui-icon ui-icon-close"></span>
                 </dd>
             <?php endforeach; ?>
         <?php else: ?>

airtime_mvc/application/views/scripts/playlist/update.phtml

@@ -17,6 +17,7 @@ if (count($items)) : ?>
             </div>
             <div class="text-row">
                 <span class="spl_artist"><?php echo $item["CcFiles"]['artist_name'] ?></span>
+                <span class="spl_artist"><?php echo ($item["CcFiles"]['file_exist'])?"":"NO FILE FOUND!" ?></span>
                 <span class="spl_offset"><?php echo $item["offset"]?></span>
             </div>
             <?php //create the crossfade icon.