added information of support evidence for each node
added skip_mmerge support
"double" instead of "float" and MIN_DIFF_LK command line option
Fixed tree_support output ("T" NHX tag)
Empty trees allowed
Removed misleading intermediate files
Fixed species tree usage + some debug
MIN_DIFF_LK option on the command line in "phyml" mode
Prints the filtered alignment in a file
Cannot build a tree if the filtered alignment has 0 columns
Fixed bug when loading an empty alignment