Stop caching sqlite3 connection between calls, because a connection
cannot be shared between multiple threads. Close the connection after
each transaction.
As reputation support is experimental and still under development, the
database is being kept in memory and is lost after every server restart.
git-svn-id: svn://svn.code.sf.net/p/crossfire/code/maps/trunk@20493 282e977c-c81d-0410-88c4-b93c2d0d6712