Improve search.

Find as you type.
Add shortcut.
Hide search widgets when not used.

Refs #24

src/gui/DatabaseTabWidget.cpp

@@ -364,6 +364,11 @@ void DatabaseTabWidget::deleteGroup()
     currentDatabaseWidget()->deleteGroup();
 }
 
+void DatabaseTabWidget::toggleSearch()
+{
+    currentDatabaseWidget()->toggleSearch();
+}
+
 void DatabaseTabWidget::updateTabName(Database* db)
 {
     int index = databaseIndex(db);