"Get sequence" fixes.
"Get sequence" fixes.

* Show feature name, if available, in fasta header.
* When viewing genomic +/- x bp, accordingly update locus in fasta header.
* Show correct sequence type in fasta header (previously all sequences were
  labelled transcript).

Signed-off-by: Anurag Priyam <6e6ab5ea9cb59fe7c35d2a1fc74443577eb60635@gmail.com>

kimrutherford/afra,wurmlab/afra,kimrutherford/afra,kimrutherford/afra,kimrutherford/afra,wurmlab/afra,wurmlab/afra,wurmlab/afra,kimrutherford/afra