Beta version 1.6.6.b

NOTE: Do not use this beta version unless you are asked to test it.

Bugfixes:

• Memory leak in reading NEXUS alignment (possibly fix --runs option reported by David Maddison).
• Crash with resampling strategy (-bsam) for standard bootstrap (-b) and jackknife (-j option).
• Standard bootstrap with partition merging (-m ...MERGE) (reported by Guoqing Li).
• Wrong error with codon models and -t RANDOM (reported by Karen Meusemann).
• Parsing error with blank chars in partition file (reported by David Maddison).

Bugfixes from v1.6.6.a:

• Issue with internal tree node names changed from slash to underscore (reported by JP Flandrois).
• ASSERT with protein mixture models (reported by Giddy Landan).
• Disallow specifying both --runs with -lmap option (reported by Giap Nguyen)
• Reading nexus composite characters for non-DNA data (reported by a web user)
• Support amino-acid O (22nd amino-acid), which is regarded as missing data (reported by Cuong).
• Initialising free-rate model, which may create negative rates in rare cases (reported by Paul Frandsen).