Increase coverage

[navidcy]

Minor changes in tests to increase coverage in BarotropicQG, BarotropicQGQL, MultilayerQG modules and in utils.jl.

[coveralls]

Pull Request Test Coverage Report for Build 228

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+1.2%) to 97.847%

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Totals
Change from base Build 214:	1.2%
Covered Lines:	500
Relevant Lines:	511

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💛 - Coveralls

[codecov]

Codecov Report

Merging #26 into master will increase coverage by 1.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #26      +/-   ##
==========================================
+ Coverage   96.67%   97.84%   +1.17%     
==========================================
  Files           6        6              
  Lines         511      511              
==========================================
+ Hits          494      500       +6     
+ Misses         17       11       -6

Impacted Files	Coverage Δ
src/barotropicqg.jl	100% <0%> (+0.84%)	⬆️
src/multilayerqg.jl	95.4% <0%> (+1.14%)	⬆️
src/barotropicqgql.jl	100% <0%> (+1.65%)	⬆️
src/utils.jl	100% <0%> (+4.76%)	⬆️

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[navidcy]

This is very minor so I'm merging.