update IndexBroser_p add to blacklist button

add feedback to user on success

htroot/IndexBrowser_p.html

@@ -170,7 +170,7 @@ var solr= $.getJSON("solr/collection1/select?q=*:*&start=0&rows=0&wt=json&facet=
       <legend style="display: inline">Browser for <a href="#[path]#" target="_blank">#[path]#</a>
         <span style="padding-left: 25px">
           <form style="display: inline" action="IndexBrowser_p.html?path=#[path]#" id="searchform" method="get" role="search">     
-            <button type="submit" name="addtoblacklist" class="btn btn-xs btn-default">Add to blacklist</button>
+            <button type="submit" name="addtoblacklist" class="btn btn-xs btn-default">Add to blacklist #(blkadded)#::<span class="text-success glyphicon glyphicon-ok"></span>::<span class="text-danger glyphicon glyphicon-remove">#(/blkadded)#</button>
             <input type="text" name="path" value="#[path]#" hidden="true"/>
           </form>    
         </span>

htroot/IndexBrowser_p.java

@@ -666,10 +666,17 @@ public class IndexBrowser_p {
                     if (hoststr.startsWith("www.")) { // to allow the automatic matching for www.host.com and host.com
                         hoststr = hoststr.substring(4);
                     }
-                    addBlacklistEntry(
+                    final boolean isok = addBlacklistEntry(
                             blacklistname,
                             hoststr + "/.*"); // as yacy expands host pattern to match www.host.com as well as host.com no need to prefix with "*." 
+                    if (isok) {
+                        prop.put("files_blkadded", 1); // glyphicon-ok on (display)
+                    } else {
+                        prop.put("files_blkadded", 2); // failure - glypicon-remove on
+                    }
                 }
+            } else {
+                prop.put("files_blkadded", 0); // glyphicon-ok off
             }
         }
 

source/net/yacy/repository/BlacklistHelper.java

@@ -58,7 +58,7 @@ public final class BlacklistHelper {
      * Adds a new entry to the chosen blacklist.
      * @param blacklistToUse the name of the blacklist the entry is to be added to
      * @param entry the entry that is to be added
-     * @return true when no error occurred and the entry was successfully added
+     * @return true when no error occurred and the entry was successfully added or exists
      */
     public static boolean addBlacklistEntry(
             final String blacklistToUse,