Major changes in 3.21.92:
* Fix libgd warning (Bastien Nocera)
* Numerous batch renaming improvements and fixes (Alex Pandelea, Carlos Soriano)
* Detect .bz and .xz as extensions for renaming (Alex Pandelea)
* Fix operations popover too small (Ernestas Kulik)
* Add dummy --no-desktop option so Dropbox plugin works again (Carlos Soriano)
* Fix build when using the --disable-tracker compile time option (Carlos Soriano)