A path toward a file containing the different levels of outgroups.
print.option={boolean}
If set to true, the unrootable trees are printed as unrooted in the output file, otherwise the unrootable trees are not printed.
tryAgain.option={boolean}
If set to true and ReRoot finds a non-monophyletic outgroup, it tries the next outgroup.
Otherwise, if ReRoot finds a non-monophyletic outgroup, the analysis for this tree is interrupted.
No more outgroup are analysed.