fix lingering off-by-one error

The arrays added to the EdgeData and VertexData of the newly
created tree were one tuple larger than they should have been.

Change-Id: I4a33585a98f274ecfeb69c66ced5244a895f6fad
Merge topic 'newick_reader_off_by_one' into master

83a2ffd9 fix lingering off-by-one error