Add SA-AMG (PRECOND=22) and LOGLEVEL to !SOLVER keyword reference

Kazuya Gotorequested to merge
feature/saamg-preconditioner into main
  • Add PRECOND=22 (SA-AMG built into HEC-MW) to the preconditioner list
  • Add the LOGLEVEL parameter for AMG preconditioner diagnostics
  • Add "In case of PRECOND=22" section describing the 4th line (10 integers) and the 5th line (8 reals) with their default values
  • Note that the 4th line is also read for PRECOND=22
  • Add three usage examples for PRECOND=22

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