remove shared cache mode, it's not needed

anki/db.py

@@ -22,7 +22,6 @@ except ImportError:
         from sqlite3 import dbapi2 as sqlite
     except:
         raise "Please install pysqlite2 or python2.5"
-sqlite.enable_shared_cache(True)
 
 from sqlalchemy import (Table, Integer, Float, Column, MetaData,
                         ForeignKey, Boolean, String, Date,

anki/importing/anki10.py

@@ -74,6 +74,7 @@ class Anki10Importer(Importer):
         # update total and refresh
         self.total = len(res['added-facts']['facts'])
         src.s.rollback()
+        src.engine.dispose()
         self.deck.flushMod()
         self.deck.finishProgress()
 

tests/test_importing.py

@@ -59,6 +59,7 @@ def test_anki10():
     i.doImport()
     assert i.total == 2
     deck.s.rollback()
+    deck.close()
     # import a deck into itself - 10-2 is the same as test10, but with one
     # card answered and another deleted. nothing should be synced to client
     deck = DeckStorage.Deck(file)