- with regards to (bnc #815200) following runtime checks were added
  + check if the specified system size is not smaller than the
    sum of the specified partition/volume sizes
  + recommend to specify a swap size if swap is requested and a
    specific system and or partition/volume size was specified
  + check if partition/volume path exists in the unpacked tree
  + check if size of partition/volume in the unpacked tree is smaller
    than the requested partition/volume size
  + check if specified system size is not smaller than the overall
    size of the unpacked tree
  + check if the calculated free space according to the requested
    system size value and the current size of the unpacked tree is
    big enough to resize the partitions/volumes to its requested
    size
- fixed schema documentation:
  + if the size of a volume is set too small this is now treated
    as an error and kiwi exits. formerly this was ignored and kiwi
    used the value it calculated itself for the volume
- fixed misleading warning message in __getBootSize().
  if wanted and needed boot partition space is the same a
  warning message was printed which is not useful