Londiste compare and repair fixes

Londiste compare and repair fixes

Deprecated Londiste command line parameter --copy-condition.
Londiste handler part.py must be used instead as it leaves
configuration in maintainable state.

Fixed Londiste compare and repair for one to many and
many to one repliaction use cases. Now filtering
condition is applied on both ends and datasets compared
should be the same.

Cleaned up database splitting howto.