renamed transposon_sequence_set.embl.txt

- changed to transposon_sequence_set_9.42.embl.txt
- checked that releases/transposon_sequence_set_9.42.embl.txt is the
same as
ftp://ftp.flybase.net/releases/FB2014_02/precomputed_files/transposons/t
ransposon_sequence_set.embl.txt.gz