+0.02_01 2008-07-30
+ - support multi column primary keys
+ - rename Change to ChangeLog to avoid conflict with mysql reserved word
+ - fix schema composition when sharing connection
+ - support for nested transactions (produce one changeset, but support stubs
+ for nested changesets in place)
+ - removed dummy table
+ - various other cleanups
+ - calling current_changeset outside of txn_do is fatal
+ - fix 'now()' default value, timestamp happens in perl space instead
+ - also call txn_do on the journal schema if the storage object differs
+ - don't call txn_begin twice
0.01 2007-08-11:
Initial version