ENH: Improve error message for ordering models having mismatched constituents

[bocklund]

Changes the error message for mismatched disordered and ordered sublattices from this:

ValueError: Number of interstitial sublattices for the disordered phase (1) and the ordered phase (5) do not match. Got substitutional sublattice indices of [].

to this:

ValueError: Number of interstitial sublattices for the disordered phase FCC_A1 (1) and the ordered phase GP_MAT (5) do not match. Found substitutional sublattices in the ordered phase with indices of []. Ensure that all the constituents in the substitutional sublattices for the disordered and ordered phase match exactly and the constituents in the interstitial sublattices for the disordered and ordered phase match exactly.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.86%. Comparing base (a3ebaa0) to head (4bd0083).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #541   +/-   ##
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  Coverage    90.86%   90.86%           
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  Files           50       50           
  Lines         7892     7893    +1     
========================================
+ Hits          7171     7172    +1     
  Misses         721      721           

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