gonum / netlib / 416

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lapack/netlib: add Dpbtrf and Dpbtrs

Also move the banded matrix conversion code to the lapack/netlib package
because that's where any matrix conversion should be done. The lapacke
package should accept exactly what LAPACKE accepts which means that
unfortunately for banded matrices there will be the inevitable overhead
of two conversions: one from BLAS (Gonum) row-major format to LAPACKE
row-major format for banded matrices and one inside LAPACKE to the
FORTRAN column-major banded format. In case of Dpbtrf the inverse
conversion must be performed for the factored matrix.

lapack/netlib: add Dpbtrs

conv

54 of 54 new or added lines in 2 files covered. (100.0%)

2840 of 7346 relevant lines covered (38.66%)

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