Merge pull request #1167 from Bart39/dev

added categorization for XXX Packs
updated schema for missing showbacks
added pr from KRUgold
added remove_exact_dupes.php to remove duplicate releases that match on name, poster, group and size
fixed testing/nzb-import.php to not import import exact duplicates
changed Releases.php to use $db->queryDirect instead of $db->prepare/execute or $db->query
added check if nzb exists before trying to copy it
added check if file exists before copying to destination
ReleaseCleaning changes/fixes
check for requestid match before looping through group regex
moved all www.town.ag regexes to generic_town and check them before looping through groups
fixed duplicate case statement
removed regexes that were renaming releases with requestid's