Merge branch '584' into rq

### Fixed

- `update_from_jigsaw` failures due to stale code. Now uses a conntext on the engine to ensure closure

- Fixes errors where reference measure index was being incorrectly tracked when placing measures would fail [#606](https://github.com/USGS-Astrogeology/autocnet/issues/606)

-  Fixed #584 where importing autocnet fails on kalasiris imports by wrapping the import in a try accept.

## [0.6.0]

from numbers import Number

import numpy as np

try:

    import kalasiris as isis

import pvl

except Exception as exception:

    from autocnet.utils.utils import FailedImport

    isis = FailedImport(exception)

import kalasiris as kal

import pvl

isis2np_types = {

        "UnsignedByte" : "uint8",

    """

    isis_dtype = np2isis_types[str(arr.dtype)]

    sp_pixels = getattr(kal.specialpixels, isis_dtype)

    sp_pixels = getattr(isis.specialpixels, isis_dtype)

    null = np.argwhere(arr==sp_pixels.Null)

    lrs = np.argwhere(arr==sp_pixels.Lrs)

import numpy as np

import numpy.testing as npt

try:

    import kalasiris as isis

except Exception as exception:

    from autocnet.utils.utils import FailedImport

    isis = FailedImport(exception)

from autocnet.spatial import isis as si

from shapely.geometry import MultiPoint

from shapely.ops import cascaded_union, polygonize

class FailedImport():

    def __init__(self, exception):

        self.exception = exception

    def __getattr__(self, name: str):

        raise self.exception

def tile(array_size, tilesize=1000, overlap=500):

    stepsize = tilesize - overlap

    if stepsize < 0:

from affine import Affine

try:

    import kalasiris as isis

except:

    from autocnet.utils.utils import FailedImport

    isis = FailedImport()

import warnings

warnings.simplefilter("ignore")