added optional argument of candidate node to collapse when derooting the tree
added possibility of ignore quotes in newick strings, treating them as opaque text
Added method get_all_rootings, which returns a forest object with all rootings of the unrooted invocant
The %rooted hash returns a true value if the tree is NOT rooted, so the return value must be flipped.
Added POD header.
Added POD header.
Added documentation.
Incrementing version number for CPAN release.