proposal: PL/Pythonu - function ereport

Hi

We cannot to raise PostgreSQL exception with setting all possible fields. I
propose new function

plpy.ereport(level, [ message [, detail [, hint [, sqlstate, ... ]]]])

The implementation will be based on keyword parameters, so only required
parameters should be used.

Examples:

plpy.ereport(plpy.NOTICE, 'some message', 'some detai')
plpy.ereport(plpy.ERROR, 'some message', sqlstate = 'zx243');

Comments, notices, objections?

Regards

Pavel