Remove possible_orthologues setting, since no longer relevant
Need to be able to export multiple orthologue alignments
Implement FASTA download for variation flanking sequence
Default filename for individual alignment blocks
Merging postreleasefix/78 to release/78

* postreleasefix/78:
  Default filename for individual alignment blocks
  Implement FASTA download for variation flanking sequence
  Need to be able to export multiple orthologue alignments
  Remove possible_orthologues setting, since no longer relevant