DictionaryGrid could have a DeleteColumn/DeleteKey funciton

[Rick Spencer]

Adding this functionality externally is complex and completely unintuitive:
    def delete_keys_from_store(self, model, path, iter, keys_to_delete):
        d = model.get_value(iter,len(self.grid.keys))
        for k in keys_to_delete:
            if k in d:
                del(d[k])
        if '__desktopcouch_id' in d:
            keys = d.keys()
            for k in keys:
                if k.startswith("__desktopcouch"):
                    dc_key = k.split("__desktopcouch")[1]
                    d[dc_key] = d[k]
                    del(d[k])
                if k == "__record_type":
                    d["record_type"] = d["__record_type"]
                    del(d["__record_type"])
            self.database.delete_record(d['_id'])
            del(d["_rev"])
            del(d["_id"])
            self.database.put_record(Record(d))