Error messages are often missing in AnalyticSpectra's sanity checks

[alexrudy]

Sanity checks in AnalyticSpectra.InteropolatedSpectrumBase raise error types that don't support messaging. Errors should probably be encased in a custom error type when raised from AnalyticSpectra. Most of these errors are incorrectly categorized in this mode.

Example Traceback:

Traceback (most recent call last):
  File "./Examples/spectra.py", line 38, in <module>
    OBJECT["Resampled"] = OBJECT.frame("Interpolated")(wavelengths=WAVELENGTHS_LOWR[1:],resolution=LOWR,method='resample')
  File "/Users/alexanderrudy/Dropbox/Library/Development/Astronomy/AstroObject/AstroObject/AnalyticSpectra.py", line 866, in __call__
    return InterpolatedSpectrumBase.__call__(self,method=method,**kwargs)
  File "/Users/alexanderrudy/Dropbox/Library/Development/Astronomy/AstroObject/AstroObject/AnalyticSpectra.py", line 290, in __call__
    return method(**kwargs)
  File "/Users/alexanderrudy/Dropbox/Library/Development/Astronomy/AstroObject/AstroObject/AnalyticSpectra.py", line 606, in resample
    self._presanity(self.wavelengths,self.flux,wavelengths,resolution,upsample=upsample)
  File "/Users/alexanderrudy/Dropbox/Library/Development/Astronomy/AstroObject/AstroObject/AnalyticSpectra.py", line 454, in _presanity
    raise e
ValueError

Error should have been raised with a message. Also, a value error is regardless not a good descriptor. This error is caused by an interpolation error.