Renamed class {FullyImplicit->Linearised}BlackoilResidual.
Modify for renamed file.

Forgot this for the initial renaming commit.
Renamed more classes.

FullyImplicitSystemSolver{Interface, Simple} -> NewtonIterationBlackoil{Interface, Simple}.
Change suggested by B. Skaflestad.
Rename method linearSolve()->computeNewtonIncrement().