UB from two reflections should match expected value

[prjemian]

summary: solvers should not assume axes are provided in canonical order

• UB matrix reported by configuration different than reported by pa() #183
• closes cahkl() finds no solutions when solution is expected #186

Hao Zheng: Thanks for raising this issue!

[coveralls]

Pull Request Test Coverage Report for Build 20701084144

Details

• 13 of 13 (100.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 20373122283:	0.0%
Covered Lines:	5667
Relevant Lines:	5667

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💛 - Coveralls

[prjemian]

problem reported: #186 (comment)

... later discovered to be with usage, not the hklpy2 code itself.