NEW FEATURES
+ o There is a new image() method for "DNAbin" objects: it plots DNA
+ alignments in a flexible and efficient way.
+
o base.freq() gains an option 'all' to count all the possible bases
including the ambiguous ones (defaults to FALSE).
o A number of functions in src/tree_build.c have been modified.
o The matching representation has now only two columns as the third
- column was repetitive.
+ column was redundant.