change search order of raxml and default to 1 thread
raxml PTHREADS needs 2 or more threads, however some systems dont come with the single threaded exec
Merge pull request #115 from andrewjpage/change_raxml_exec_search_order

Change raxml exec search order
warning message when changing number of threads
Merge pull request #116 from andrewjpage/change_raxml_exec_search_order

warning message when changing number of threads
fasttree executables with titlecase and lowercase
Merge pull request #117 from andrewjpage/fasttree

fasttree executables with titlecase and lowercase