Add Classes of MeasurementError

Some measurement failures are global for a whole exposure, such as a missing Psf or Wcs. The framework currently does not distinguish this from a failure in a single measurement.

Should add a new subclass of MeasurementError which can be thrown in these cases.

Should also add configuration option to the measurement framework to determine what should be done with this type of error.

We should also add an exception class and associated how-to-handle config for problems that indicate that something has gone wrong in pre-measurement processing, such as NaNs in the image.