Formatting of POD & code.
Merging, with adaptions, of patch from Andy Yates: Changes to regular expressions for detecting multi-species databases, including multi-species compara and ancestral databases. Added method find_and_add_aliases() which in the future may be used to read species name aliases directly from the meta tables rather than having the species aliases hard-coded in this module. Tested with multi-species databases as well as with native Core databases.
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