Add exclusion in tag search

  * Searching '-mytag' will now exlude all shaares with 'mytag' tag.
  * All tags starting with a '-' are renamed without it (through the Updater).
  * Unit tests.

Minor code changes:

 * LinkDB->filter() can now take no parameters (get all link depending on logged status).
 * tagsStrToArray() is now static and filters blank tags.

1 files changed, 1 insertions, 1 deletions

diff --git a/application/LinkDB.php b/application/LinkDB.php
index a95b3f36..416aa0d3 100644
--- a/application/LinkDB.php
+++ b/application/LinkDB.php
@@ -340,7 +340,7 @@ You use the community supported version of the original Shaarli project, by Seba
      *
      * @return array filtered links
      */
-    public function filter($type, $request, $casesensitive = false, $privateonly = false)
+    public function filter($type = '', $request = '', $casesensitive = false, $privateonly = false)
     {
         $linkFilter = new LinkFilter($this->_links);
         $requestFilter = is_array($request) ? implode(' ', $request) : $request;