Properly Convert References in Compound Datasets

[lawrence-mbf]

Fixes #528

Motivation

Normal references appear to work but references embedded in compound datasets do not which causes errors on reshaping the data.

How to test the behavior?

See #528

Checklist

• Have you ensured the PR description clearly describes the problem and solutions?
• Have you checked to ensure that there aren't other open or previously closed Pull Requests for the same change?
• If this PR fixes an issue, is the first line of the PR description fix #XX where XX is the issue number?

[codecov]

Codecov Report

Merging #529 (68924c2) into master (b7583a3) will increase coverage by 0.06%.
The diff coverage is 92.79%.

@@            Coverage Diff             @@
##           master     #529      +/-   ##
==========================================
+ Coverage   87.61%   87.67%   +0.06%     
==========================================
  Files         130      132       +2     
  Lines        5537     5550      +13     
==========================================
+ Hits         4851     4866      +15     
+ Misses        686      684       -2     

Files Changed	Coverage Δ
+io/parseCompound.m	73.52% <73.52%> (-3.40%)	⬇️
+io/parseReference.m	86.11% <86.11%> (+0.81%)	⬆️
+types/+untyped/@DataStub/export.m	94.11% <94.11%> (ø)
+types/+untyped/@DataStub/DataStub.m	95.50% <95.50%> (ø)
+types/+untyped/@DataStub/load_mat_style.m	95.74% <95.74%> (ø)
+tests/+util/verifyContainerEqual.m	98.24% <98.24%> (-1.76%)	⬇️

... and 2 files with indirect coverage changes

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