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Function: Recursively fetch all the nodes and their descendents
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*NOTE* This is different from each_Descendent
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Returns : Array or Bio::Tree::NodeI objects
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Args : $sortby [optional] "height", "creation", "alpha", "revalpha",
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my ($self, $sortby) = @_;
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foreach my $node ( $self->each_Descendent($sortby) ) {