Start adding quality factor
Properly translate fold/quality into quality factor

Also add db migration file
finish direct target searching algorithm
Add missing constants
Fix some small coding problems in direct search
Use only one query for direct target search (though it still doesn't work)
Make direct target search work

An extra _gene_cache key was added in serialization, so ignore it.
Require both groups of experiments for direct target search
Change response to direct_search when form is not valid
The direct targets working except for some minor bugs. Changed the views urls and form It doesnt work on a empty form
Resolved some conflicts'
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Merged the quality whatever to master.