Alert performance optimization

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Original report by Luca Bruno (Bitbucket: lukkia, GitHub: lucabruno91).

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GetFeatureCollection with MULTIPOLYGON associated to alerts is slow.

Store as Area of interest the bbox of the alert, while the MULTIPOLYGON must be stored in an additional property, only fetched during GetAlertById

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Original comment by Luca Bruno (Bitbucket: lukkia, GitHub: lucabruno91).

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Alert's AreaOfInterest performance improvement ref #147

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Original changes by Luca Bruno (Bitbucket: lukkia, GitHub: lucabruno91).

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• changed state from "new" to "resolved"