- Redesigned search tab to improve usability

- Started work on categorized searching but not yet functional

src/searchEngine.h

@@ -90,7 +90,6 @@ class SearchEngine : public QWidget, public Ui::search_engine{
     void updateNova();
     void saveSearchHistory();
     void on_enginesButton_clicked();
-    void on_clearPatternButton_clicked();
     void propagateSectionResized(int index, int oldsize , int newsize);
     void saveResultsColumnsWidth();
 		void downloadFinished(int exitcode, QProcess::ExitStatus);