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, 4 insertions, 2 deletions

diff --git a/tests/LinkDBTest.php b/tests/LinkDBTest.php
index 3b1a2057..06edea79 100644
--- a/tests/LinkDBTest.php
+++ b/tests/LinkDBTest.php
@@ -276,7 +276,8 @@ class LinkDBTest extends PHPUnit_Framework_TestCase
                 'media' => 1,
                 'software' => 1,
                 'stallman' => 1,
-                'free' => 1
+                'free' => 1,
+                '-exclude' => 1,
             ),
             self::$publicLinkDB->allTags()
         );
@@ -295,7 +296,8 @@ class LinkDBTest extends PHPUnit_Framework_TestCase
                 'html' => 1,
                 'w3c' => 1,
                 'css' => 1,
-                'Mercurial' => 1
+                'Mercurial' => 1,
+                '-exclude' => 1,
             ),
             self::$privateLinkDB->allTags()
         );