[MERGE] [ADD] ways to correctly handle local datetimes in e.g. domains

* Alter datetime.now(), generate a local datetime (add utcnow() which generates a UTC datetime)
* Implement datetime.replace() to manipulate local datetimes
* Implement date.today(), generates a local date
* Implement datetime.toJSON(), returns a javascript Date (assumes datetime attributes are local)
* Add conversion hook in JSON and JSONP handlers, automatically converts a Date object to a UTC datetime formatted according to server formats

Should allow the generation of correctly working (from the end-user's POV) [Today] filters, amongst other things.
Eg: a local expression in a domain for 'Today 00:00:00' would now be expressed as 'datetime.datetime.now().replace(hour=0, minute=0, second=0)' (no .strftime) and will be converted to UTC when sent to the server

bzr revid: mat@openerp.com-20140128133706-4yp610pp5w06tcia

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