more testing of the data access methods and some fixing

[jgrewe]

No description provided.

[codecov]

Codecov Report

Merging #838 (0f41b27) into master (8ef0d94) will decrease coverage by 0.02%.
The diff coverage is 95.12%.

@@            Coverage Diff             @@
##           master     #838      +/-   ##
==========================================
- Coverage   95.71%   95.68%   -0.03%     
==========================================
  Files         201      201              
  Lines       13691    13706      +15     
==========================================
+ Hits        13104    13115      +11     
- Misses        587      591       +4     

Impacted Files	Coverage Δ
include/nix/DataView.hpp	88.88% <ø> (+11.11%)	⬆️
src/util/dataAccess.cpp	88.69% <87.50%> (-0.90%)	⬇️
src/Dimensions.cpp	92.71% <100.00%> (ø)
test/BaseTestDataAccess.cpp	100.00% <100.00%> (ø)
test/BaseTestDimension.cpp	100.00% <100.00%> (ø)

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