Fixed setting Iterable vs Int backlash

import numpy as np

import time

import logging

from collections.abc import Iterable

from .sangaboard import Sangaboard

from openflexure_microscope.stage.base import BaseStage

    @backlash.setter

    def backlash(self, blsh):

        logging.debug("Setting backlash to {}".format(blsh))

        if blsh is None:

            self._backlash = None

        elif isinstance(blsh, Iterable):

            assert len(blsh) == self.n_axes

            self._backlash = np.array(blsh)

        else:

            self._backlash = np.array([int(blsh)]*self.n_axes, dtype=np.int)

    def move_rel(self, displacement, axis=None, backlash=True):