hMeanChiSqCI()

[florafauna]

• improve input tests to solve issue https://github.com/florafauna/ReplicationSuccess/issues/69#issue-957970094.
• hMeanChiSqCI(): add example with disjunct confidence regions.
• hMeanChiSqCI(): improve search region for confidence interval bounds. Previously, conf.level = 0.5 resulted in a search region that was too small.
• hMeanChiSqCI(): change output format. Multiple CIs are now returned as matrix. This could break previous code!!
• remove the dependency on the rootSolve package.

[florafauna]

Good idea. I changed hMeanChiSqCI() to always return a matrix.