Some small improvements

[KlausVigo]

Hi @emmanuelparadis,
a few little improvements. I hope these don't collide with your recent improvements. In comparePhylo I clean up after running layout. degree.phylo might be a bit slower, but should be save if a tree has not tip.label slot, like compressed trees. I think you solved this problem differently. To read.genBank I added an argument type to allow to download protein / amino acids.
Kind regards,
Klaus

[emmanuelparadis]

All good!

I edited a bit read.GenBank() since an if .... seemed redundant as type was already set. More tests might be useful too.

I updated the NEWS and incremented the version and pushed here.

Thanks!
Emmanuel