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GETRF: add panel permutation to get a full partial pivoting available

Mathieu Faverge requested to merge satanas-atos/chameleon:WIP/ppiv_perm into master
  • Add struct fields and functions to manipulate the permutation and the inverse permutation arrays through runtimes
  • Add the kernels:
    • to convert pivots to (inverse) permutation
    • extract/set pivots rows from/to a tile matrix
  • Add the panel permutation forward and backward in getrf algorithm to get a complete partial pivoting algorithm column per column.

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