Comments on patch for date_trunc( 'week', ... );

Per a brief conversation with Tom, I've created a patch for adding support for
'week' within the date_trunc function.

Within the patch I added a couple of test cases and associated target output,
and changed the documentation to add 'week' appropriately.

Comments?  Should I of bypassed this list and subscribed/posted to the patch
list?

Cheers,
Rob

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