Autoincrement is automatic if an ID <> 0 is set

[perrein]

If i use a primary key with value <> 0, the wrapper override this value and autoincrement automaticaly, but in some situation, it's voluntary set (synchro with database offline with same id, for example).

[perrein]

Not interessed to integrate this fix?

[oysteinkrog]

Could you please add a test that demonstrates what this fixes?