Issue #1105862 by druido: Fix syntax in MySQL-specific query that resulted in PDOException with PostgreSQL.

Issue #1105862 by druido, aaron: Fix Syntax error in MySQL-specific query results in PDOException with PostgreSQL.

Issue #924644 by effulgentsia: Update old File Style formatters on Image fields to the Image formatter.

Issue #1030930 by pivica, codycraven: Fix strict warning: Only variables should be passed by reference in file_styles_strstr() (line 64).

by aaron: Copy the sample image to the public:// folder for image style previews, due to bug at [#987846].

by aaron: Ensure we don't create duplicate styles when saving, and delete duplicate entries from the styles table in an update.

#1017770 by aaron: Fix the update process was aborted prematurely while running update #7208 in styles.module.