2. Change include_object to include_media_object to avoid confusion
3. Make _validated_id_prefix method in read.py a staticmethod
4. Use new iter_<objects> methods in Records.py, StatsgGramplet.py, GivenNameGramplet.py, ExtractCity.py and _IsSiblingOfFilterMatch.py as examples
svn: r13151
bsddbtxn.py -- Wrapper for BSDDB DBTxn to support context manager protocol
txn.py -- GrampsDbTxn class to manage atomic transactions
write.py -- GrampsDbWrite class for read/write databases
read.py -- GrampsDbRead class for read-only databases
undoredo.py -- GrampsDbUndo class to manage the undo database
upgrade.py -- Helper module for upgrading a database at open time
svn: r13078