Validate some key assumptions about the fish object's data
validateInputs(frac.table, parents, nest.level, clone.labels)A numeric matrix containing tumor fraction estimates for all clones at all timepoints
An integer vector specifying parental relationships between clones
An integer vector specifying how deeply a given clone is nested in the overall hierarchy
An integer vector specifying how deeply a given clone is nested in the overall hierarchy
No return value - stops execution with an error if invalid inputs are detected