Trying to add fourier transformation
Add all
Merge branch 'master' into improve

Conflicts:
	V0.4/Chi.dat
	V0.4/Chi_omega_0.dat
	V0.4/DiaMC_Heisenberg_V0.4.f90
	V0.4/DiagMC
	V0.4/DiagMC.f90
	V0.4/DiagMC_V0.4.f90
	V0.4/G.dat
	V0.4/G_omega_0.dat
	V0.4/Pi.dat
	V0.4/Pi_omega_0.dat
	V0.4/W.dat
	V0.4/W_omega_0.dat
	V0.4/tags
	V0.4/vrbls_mc.f90
	V0.4/vrbls_mc.mod