Added .fa fasta ext and error if ext not recognised. #432
Added .fa fasta ext and error if ext not recognised. #432

Anaphory/beast2,Anaphory/beast2,CompEvol/beast2,CompEvol/beast2,tgvaughan/beast2,CompEvol/beast2,tgvaughan/beast2,tgvaughan/beast2,Anaphory/beast2,Anaphory/beast2,CompEvol/beast2,tgvaughan/beast2