IQ-TREE version 1.6.4

Apr 30, 2018

News:

New option --runs to perform multiple tree searches (issue #64 requested by David Maddison). This is motivated by a recent evaluation (Zhou et al. 2018) showing that 10 independent runs outperformed single run in terms of likelihood maximisation.
Print branch lengths scaled in number of substitutions for PoMo models.
Support specifying 6 GTR rates and G-T rate to be zero from command line (requested by Ben Redelings).
New option --show-lh to compute tree log-likelihood without parameter optimisation (issue #67).

Bugfixes:

Fix compilation with gcc 4.8.
Incorrect parsing +P for PoMo model string (thanks Carolin Kosiol).
Issue #66: Incorrect frequency mixture model when coupled with GTR20 (reported by Dominik Schrempf).
.ufboot trees file contains partial branch supports by combination of -bb and -alrt (reported by Guifre Torruella Cortes).
Crash in likelihood computation for +ASC model when some states are rare (reported by Paul Madeira).
Numerical instability for codon models by reducing upper bound of omega/kappa from 100 to 50 (reported by Aleksas Lab).
Crash reading DNA model from file (reported by Benjamin Redelings).
Crash with -z option with rooted trees in the presence of identical sequences (reported by cjp1043).