Move programmatic alias creation into find_and_add_aliases().

# Some aliases are added programatically.
# 1) The "species_name"
# 2) The "species name"
# 3) The "sname" (1+last part)
# 4) The "snam" (1+3 letters)
# 5) The "spenam" (3+3 letters)

# Others are read from the meta table.
# 6) Any species.alias
# 7) The species.taxonomy_id
# 8) The assembly.name
# 9) The species.common_name (if it exists)