Fixed PAMLdat path.
CodonAlphabet is now ordered by the translation table - standard code
conforms to PAML ordering.
Added ECM PAML dat files.
Added script to recreate empirical codon models.
Makefile fix.
Added classes handling empirical codon models.
Added ECM Rdata files.
 with '#' will be ignored, and an empty message aborts the commit.
Added ECM Rd files.
Doc fix.