make linkoo not create backups by default
make linkoo not create backups by default

The 'linked' files are not used by anything, and they just waste space.
If somebody wants them for debugging or whatever reason, use --backup.

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core