Codon substitution models v2.0.0

Compatible to BEAST 2.7.*.

Codon substitution models v1.1.3

The release for BEAST 2.6.0.

-fix BEAUti template.

Codon substitution models v1.1.2

• correct improper implementation to suppress BEAUti "split" button.
• handle partial nucleotide ambiguities (i.e. -TA)

Codon substitution models v1.1.1

• Handle ambiguities in Amino Acid level, such as "---".
• Treat codons with nucleotide ambiguities as missing data "---", such as "-TA".

Codon substitution models v1.1.0

The first release for BEAST 2.5.0. M0 is implemented.