Create a single interesting groups column (interestingGroups) used for coloring in plots. When multiple interesting groups are present, unite into a single column, delimited by a colon.

uniteInterestingGroups(object, ...)

## Arguments

Modified object. Now contains an interestingGroups column.
class(uniteInterestingGroups)#> [1] "nonstandardGenericFunction"
#> [1] "methods"