- Modify mksanta.py to work on fasta files with unstructured names.
  Now we can use a consistent procedure to create the first config from raw hiv-pol fasta file.
- Change mkbeast.py to use generation numbers as days when associating dates with taxons.
- Add HIV-POL as outgroup to relaxed-clock.xml template file.
  Probably want to do this from mkbeast.py instead for more flexibility,
  but this is a simple solution for right now.