QC: Flag QC Checklist Items

[mattroumaya]

QC Details

• Flag() should pass all checks on the release QC checklist. No major errors and fine for v0.1.0, but plan to address before v0.2.0.
• See more details in QC for Additional Updates/Assessment Pipeline #215

Additional Comments

1. Update @params

• Minor fix: clean up capitalization and punctuation for @params

2. Update stopifnot() checks

• Check that SiteID %in% names(dfAnalyzed)
• Check that length(strColumn) == 1
• Add descriptions to stopifnot() errors

3. Update unit tests

• Add test to confirm SiteID is in input
• Currently uses safetyData for unit tests
• Need test to confirm input data contains columns: SiteID, strColumn (default = "Pvalue")
• Need to add explicit test for expected output column names