remove one check of image and payloads when adding to repo

        # cannot add already existant image

        if self.has(image.name, image.version):

            raise Exception("Image already in database, delete first!")

        # checking data tarballs md5 before copy

        image.check("Check image and payload before copy")

        # adding file to repository

        arrow("Copying images and payload")

        for obj in [ image ] + image.payload.values():

        # checking must be done with original md5

        r_image.md5 = image.md5

        # checking image and payload after copy

        r_image.check("Check image and payload after copy")

        r_image.check("Check image and payload")

        # add description to db

        arrow("Adding metadata")

        self.db.begin()