No frill addition of set/get/extract gene node features from node name (based on pre-existing species functions
Fix indentation error
Fix bug that slipped through while making the _extract_feature function more generic. Change gpos to simply pos (position of desired feature).
Merge pull request #1 from UdeM-LBIT/set_genes

Set genes
Adding function in library (TreeClass/TreeUtils), Polysolver and upgma algo, need clean up
merged with set_gene