Formatting of SYNOPSIS code.

Passes unit tests.

  Make sure that transcripts created by the adaptor has their
  'edits_enabled' set to true.  This ensures that post-translational
  modifications takes effect, crucially translating selenocysteines into
  'U' rather than into stop codons ('*').

updated to include gene_gc attribute calculation, even not being a density feature, convenient to submit all jobs from same wrapper

	QUERY_IDENTITY	->	XREF_IDENTITY
	TARGET_IDENTITY	->	ENSEMBL_IDENTITY
	QUERY_START	->	XREF_START
	QUERY_END	->	XREF_END
	TRANSLATION_START	->	ENSEMBL_START
	TRANSLATION_END	->	ENSEMBL_END

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.

schema_version.

Added missed quotes.

Minor formatting.

give warning if strain is not in database or for this particular strainSlice, there is no genotype data available in new method