Batch file renamer

application: ff_rename
ff_rename is a very powerful renaming tool that you need when renaming a large number of files.

These are the key features:

* simple / export mode
* very powerful selecting / unselecting tools
* regular expressions (egrep)
* undo of renaming
* very complex naming rules possible
* trim long filenams to a certain size
* preview changes as a list (new vs. old)
* saving / loading rules
* multithreading support throuhout the whole application
(aka "no beachball" even when working with a large number of files)