Prediction filtering can be separated by logical OR/AND

Previously when combining filters on predictions and scores, the search automatically separated each filter on a conditional AND by default. The change we've made recently, is to allow users to specify the logical operator (AND/OR) between the prediction and scores filters such that you can query the database by saying give me all the variants that have polyphen prediction 'probably damaging' OR clinvar prediction 'pathogenic' in a single query. Previously, if you had to do this, you would run separate searches for each polyphen and clinvar.

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