Add categoryid,imdbid,nzbstatus,rageid and totalpart options to delete_releases.php

Merge friendly copy of PR1523 without ChangeLog entry
Merge branch 'kaibosh-dev-kaibosh-delrel2' into dev
Merge pull request #1527 from kaibosh
Attempting to add coverurl attribute to API.
Quick and Dirty attempt to add covers url to API results.
Fixing typo.
Adding Q+D method to Utility to create/check path to cover images.
Replacing check for creating cover url as jpgstatus isn't what I thought it was ;-)
Changing Utility::getCoversURL() to return missing image path if requested image does not exist.
Cleanup
Adding code and function to add cover URL to a releases array.
Fixing covers URL to include 'covers'.
Oops, forgot the directory separator.
Removing unneeded require_once.
Change Movie Cover URL's to allow for display without a specific IMDB ID i nthe API query (nzb360 isn't specifying the IMDB)
Merge branch 'dev-api' of https://github.com/nZEDb/nZEDb into dev-api

Merge dev into dev-api after rebase