Cross-section material representation.

Modules
	Cells for cross-section discretization.
	Geometric representation of a cross-section.

Classes
class	XC::CrossSectionProperties2d
	Mechanical properties of a cross section (area, moments of inertia,...) for a bi-dimensional problem (three DOB for each section). More...
class	XC::CrossSectionProperties3d
	Mechanical properties of a section (area, moments of inertia,...) in a three-dimensional problem (six degrees of freedom on each section). More...
class	XC::DiscretBase
	Base class for cross-section discretization. More...
class	XC::SeccionInerte
	Cross-section representation able to return mechanical propertis a area, moments of inertia,... More...

Detailed Description