Add functions

Types:
	+ pieIntegrationMethod

Functions:
pieCSRGenMatrix.h
	+ pieCSRGenMatrixComplexAddValue

pieIntegration.h
	+ pieIntegrationDouble1DRectangle
	+ pieIntegrationDouble1DTrapezoidal
	+ pieIntegrationDouble1DGauss2
	+ pieIntegrationDouble1DGauss3
	+ pieIntegrationDouble1DGauss4
	+ pieIntegrationDouble1D