+2005-04-16 by mst
+ - set_from_related should take undef
+ - ResultSource objects caching ->resultset causes interesting problems
+ - find why XSUB dumper kills schema in Catalyst (may be Pg only?)
+
2006-04-11 by castaway
- using PK::Auto should set is_auto_increment for the PK columns, so that copy() "just works"
- docs of copy() should say that is_auto_increment is essential for auto_incrementing keys