- fixed calculation of inode number in KIWIBoot constructor
  for vmx images which requested a specific size in the XML
  description it's required to calculate the inode count
  from the specified size and not from the size of the of
  the unpacked root tree. If the requested image size is
  much bigger than the unpacked root tree it might happen
  that we run out of inodes very soon in the later image
- make sure zImage kernels for arm gets detected
- fixed calculation of inode number if no XML size is set
  in this case the variable contains the value 'auto' and
  this can't be used in numeric expressions
- added attribute syncMBR in the type element to activate
  the MBR synchronisation into the GPT for efi images