Feature request: add an "overwrite" option for clone/update operations

[ThePirate42]

Right now, as far as I understand, auracle tries to do some fancy git stuff under the hood when a clone of the aur package repo already exists. This sometimes causes problems, and in that case I have to remove manually the folders so that auracle will do a "clean clone". It would be nice if auracle had some option to erase and replace an old clone automatically.