Integrators for eigenproblems.

Classes
class	XC::KEigenIntegrator
	Integrator used to obtain the eigenvalues and eigenvectors of the stiffness matrix. More...
class	XC::LinearBucklingIntegrator
	LinearBucklingIntegrator is an algorithmic class for setting up the finite element equations for a linear buckling analysis. More...
class	XC::EigenIntegrator
	Base class for eigenproblem integrators. More...

Detailed Description