Add: New option to avoid to modify database (no updates, only renaming).
Add: New option to force update the GUID (aka "File name"...). Not recommended _at all_.
Fix: Options were without effect.

git-svn-id: https://plugins.svn.wordpress.org/media-file-renamer/trunk@1004261 b8457f37-d9ea-0310-8a92-e5e31aec5664