Implement delete thumbnail entry

Implement delete cache_dir on database change

cps/fs.py

@@ -16,7 +16,6 @@
 #   You should have received a copy of the GNU General Public License
 #   along with this program. If not, see <http://www.gnu.org/licenses/>.
 
-from __future__ import division, print_function, unicode_literals
 from . import logger
 from .constants import CACHE_DIR
 from os import makedirs, remove