Extra leading array indices do not work with --pmodel LC

[rrzeschorscherl]

The LC analysis in Kerncraft does not seem to cope well with arrays that have more (leading) indices than the number of loops in the nest:

$ kerncraft --machine machine-files/BroadwellEP_E5-2697_CoD.yml --pmodel LC -D M 500 -D N 500 -D L 500 --cache-predictor LC kernels/himeno.c 
================================== kerncraft ===================================
kernels/himeno.c                        -m machine-files/BroadwellEP_E5-2697_CoD.yml
-D L 500 -D M 500 -D N 500
-------------------------------------- LC --------------------------------------
Traceback (most recent call last):
  File "/home/gh/programming/python/bin/kerncraft", line 11, in <module>
    sys.exit(main())
  File "/home/gh/programming/python/lib/python3.5/site-packages/kerncraft/kerncraft.py", line 289, in main
    run(parser, args)
  File "/home/gh/programming/python/lib/python3.5/site-packages/kerncraft/kerncraft.py", line 255, in run
    model.analyze()
  File "/home/gh/programming/python/lib/python3.5/site-packages/kerncraft/models/layer_condition.py", line 222, in analyze
    raise ValueError("Can not apply layer-condition, order of indices in array "
ValueError: Can not apply layer-condition, order of indices in array does not follow order of loop indices. Single-dimension is currently not supported.