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- this helps for trapping unguarded dictionary lookups.

LduMatrix/SolverPerformance: Changed nIterations from label to labelType corresponding to the type solved

Now the number of iterations to solve each component in a segregated
solution are stored and returned in the SolverPerformance class.

Resolves bug-report http://bugs.openfoam.org/view.php?id=2189

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4340.html

to specify the minimum number of iterations the solver should perform.

Replaced lduMatrix::solverPerformance with SolverPerformance<scalar>

LduMatrix: coupled solvers are now run-time selectable for solving fvMatrices by conversion of the fvMatrix/lduMatrix to LduMatrix

LduMatrix: Added support for both component-coupled and component-independent forms of PCG and PBiCG

This reverts commit c5bea524.

This reverts commit b18f6cc1.

  - can now use dictionary substitutions and regular expressions in
    system/fvSolution

  - foamUpgradeFvSolution application to convert system/fvSolution
    (with -test option)

motion solver syntax left as-is.