Further rationalisation of the handling of "Final" solver settings

The selection of the "Final" solver settings is now handled automatically within
the "<equation>.solve()" call and there is no longer any need no provide a bool
argument for specific cases.  This simplifies the solution algorithm loop
structures and ensures consistency in behaviour across all solvers.

All tutorials have been updated to correspond to the now consistent rules.

tutorials/DNS/dnsFoam/boxTurb16/system/fvSolution

@@ -17,7 +17,7 @@ FoamFile
 
 solvers
 {
-    p
+    "p.*"
     {
         solver          PCG;
         preconditioner  DIC;

tutorials/electromagnetics/mhdFoam/hartmann/system/fvSolution

@@ -44,7 +44,7 @@ solvers
         relTol          0;
     }
 
-    "(U|B)"
+    "(U|B).*"
     {
         solver          smoothSolver;
         smoother        symGaussSeidel;