disable BLAST button while the current query is in progress
disable BLAST button while the current query is in progress

While not exactly same as #11, it does provide a visual feedback that the
current query is being processed. And more importantly, prevents users from
resubmitting multiple times if the query happens to much time.

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

jasminZ/sequenceserver,deepakunni3/sequenceserver,vivekiitkgp/sequenceserver,elsiklab/sequenceserver,vivekiitkgp/sequenceserver,jasminZ/sequenceserver,jasminZ/sequenceserver,aldermossy/sequenceserver,elsiklab/sequenceserver,yeban/sequenceserver,aldermossy/sequenceserver,lepbase/lepbase-sequenceserver,aldermossy/sequenceserver,aldermossy/sequenceserver,IsmailM/sequenceserver,lepbase/lepbase-sequenceserver,yeban/sequenceserver,yeban/sequenceserver,elsiklab/sequenceserver,vivekiitkgp/sequenceserver,yeban/sequenceserver,deepakunni3/sequenceserver,IsmailM/sequenceserver,lepbase/lepbase-sequenceserver,IsmailM/sequenceserver,deepakunni3/sequenceserver