CHANGES IN APE VERSION 2.5-1
+NEW FEATURES
+
+ o The new function stree generates trees with regular shapes.
+
+ o drop.tip(), extract.clade(), and root() now have an 'interactive'
+ option to make the operation on a plotted tree.
+
+
BUG FIXES
o rTraitDisc() did not use its 'freq' argument correctly (it was
multiplied with the rate matrix column-wise instead of row-wise).
+ o [node|tip|edge]labels(thermo = ) used to draw empty thermometers
+ with NA values. Nothing is drawn now like with 'text' or 'pch'.
+ The same bug occurred with the 'pie' option.
+
CHANGES IN APE VERSION 2.5