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Preconditioner routines

The base PSBLAS library contains the implementation of two simple preconditioning techniques:

Diagonal Scaling
Block Jacobi with ILU(0) factorization

The supporting data type and subroutine interfaces are defined in the module psb_prec_mod. The old interfaces psb_precinit and psb_precbld are still supported for backward compatibility

Subsections

init -- Initialize a preconditioner
build -- Builds a preconditioner
apply -- Preconditioner application routine
descr -- Prints a description of current preconditioner
clone -- clone current preconditioner
free -- Free a preconditioner