- fixed UEFI bootloader setup for grub2 based disk images
  + fixed creation of image install CDs in EFI mode
  + call findAndCopyMagicBlock only if hybrid is requested
- fixed KIWILinuxRC::installBootLoaderGrub2()
  + install grub2 only in BIOS mode, in EFI mode this doesn't make sense
  + make sure the grub2 config file also lands on the EFI (fat) partition
    when in UEFI mode the precompiled and signed grub.efi image searches
    there for the configuration
- fixed grub2 setup for older distros which packages into lib/grub2-efi