2.0.0.rc2

1. A programming error prevented databases from being deselected when you go back to the search form after submitting a query. That's now fixed. Thanks to Norman Johnson for reporting the issue.
2. Database creation step could skip FASTA files containing too many Ns at the beginning of the file. Fixed that. Thanks to Michał T. Lorenc for reporting the issue.
3. During the initial setup, SequenceServer would print the message 'config file not found' multiple times. Fixed that.
4. Results page would fail to load completely if the submitted queries resulted in no hits. Fixed that.
5. Give users an option to sign up for release and other important announcements during the initial setup.
6. Highlight the use of non-default parameters by changing the background of advanced parameters field to yellow when filled.
7. Include SequenceServer version and a link to our paper in the search summary at the top of the results page.