Generic ECM model description in Machine File

[cod3monk]

Include description of overlap vs. non-overlap, considering all data paths as described in the memory hierarchy.

Preliminary work is started in PR #110

Rough outline of required changes:

• [ ] Make code (ECMData, Roofline(?) and Benchmark(?)) independent of strict L1-L3 cache hierarchy
• [ ] Find generic description in machine file
• [ ] Support this description in ECM model
• [ ] Consider this in all analysis reports
• [ ] Conder this also for PhenoECM
  • [ ] Get rid of hardcoded T_nOL, T_L1L2, T_L2L3 and T_L3MEM