Linear least squares solve() method moved from  GaussNewtonSolver to QuadraticSolver. Added explanation of applyInverseHessian method.
Linear least squares solve() method moved from 
GaussNewtonSolver to QuadraticSolver.
Added explanation of applyInverseHessian method.


dhale/jtk,dhale/jtk,chrisengelsma/jtk,ctrueden/jtk,askogvold/jtk,chrisengelsma/jtk,askogvold/jtk,voltnor/jtk,voltnor/jtk,dhale/jtk,MinesJTK/jtk,ctrueden/jtk,voltnor/jtk,voltnor/jtk,MinesJTK/jtk,askogvold/jtk,MinesJTK/jtk,ctrueden/jtk,ctrueden/jtk,chrisengelsma/jtk,askogvold/jtk