o image.DNAbin() did not colour correctly the bases if there were
some '-' and no 'N'.
+ o .compressTipLabel() failed with a list with a single tree.
+
o identify.phylo() returned a wrong answer when the x- and y-scales
are very different.
+ o write.nexus() failed with lists of trees with compressed labels.
+
OTHER CHANGES
o identify.phylo() now returns NULL if the user right-(instead of
left-)clicks (an error was returned previously).
+ o read.nexus() should be robust to commands inserted in the TREES
+ block.
+
CHANGES IN APE VERSION 2.7