WIP: ENH: Reforms QRMatrix class

• If applied:

  • Fixes issue #1240
  • New Test-QRMatrix.C for 3 input scenarios
  • Class output verified via NumPy, aka LAPACAK routines
  • Improves header documentation
  • Corrects Doxygen parsing problems, i.e. //-
  • Aligns code style with the code style guide
  • Applicable to Foam::complex template

• Verification: See QRMatrix_Verifications.pdf for NumPy comparisons.

• Future work:

  • Refactoring is possible if new Matrix class functions applied
  • For few matrix elements, NumPy and OpenFOAM yielded few-decimal point differences
  • //Info<< "Mx - b:" << nl << (Mx - source) << endl; affects the subsequent program states despite encapsulation. Memory leak might be the reason, will be checked

@mark