IQ-TREE version 1.4.4

Aug 28, 2016

New features:

Allowing mixture frequency model with optimized frequency via e.g. -m C10+FO (requested by Edward Braun).
Supporting GTR20 (general time reversible) amino-acid model (requested by Desmond Ramirez, Panagiotis Adam).
New option -blscale to optimize tree length scaling factor and model parameters for a user tree passed via -t option (requested by Rob Lanfear). The results are written to .blscale file in YAML format.
New option --no-outfiles to suppress printing all output files (.log, .treefile, .iqtree files).

Bug fixes:

(critical) Memory overflow for long alignments (>55,000 aa site patterns) under large mixture models (e.g. C60) (reported by Matthew Brown).
(critical) AU test implementation (reported by Jan Janouskovec).
Counting of constant sites with many ambiguous states (reported by Greg Owens).