Move clusterIndex() to Postgres.php and drop Analyze from it. Add doReindex() + let...

Move clusterIndex() to Postgres.php and drop Analyze from it. Add doReindex() + let doClusterIndex also 7.0-7.2 (only can't be seen if the index is clustered) in constraints.php and indexes.php . Really add Recluster (for >= 7.4), Reindex, Full and Freeze Vacuum (for >=7.2) in database classes and in database.php. Additional check in getLinkingKeys(). Typo fixes.