logging clean-up

- moved most constants to separate file
- sorted and cleaned-up imports
- moved logging setup to separate file

cps/db.py

@@ -18,16 +18,20 @@
 #  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 sqlalchemy import *
-from sqlalchemy.ext.declarative import declarative_base
-from sqlalchemy.orm import *
+from __future__ import division, print_function, unicode_literals
+import sys
 import os
 import re
 import ast
-from . import config
-import ub
-import sys
-import unidecode
+
+from sqlalchemy import create_engine
+from sqlalchemy import Table, Column, ForeignKey
+from sqlalchemy import String, Integer, Boolean
+from sqlalchemy.orm import relationship, sessionmaker, scoped_session
+from sqlalchemy.ext.declarative import declarative_base
+
+from . import config, ub
+
 
 session = None
 cc_exceptions = ['datetime', 'comments', 'float', 'composite', 'series']