weiyuanlou/PyCSR2D: Second release of PyCSR2D

Formula of Fx for case A,B,C,D has been corrected with the (1+x/rho) curvature term. psi_x expressions are no longer valid. All field functions now take relativistic gamma, instead of beta as the argument. IGF method has been added to deal with the singularity of the field grids. This allows Case B wake computation using the convolution of the field grid and the distribution grid.

Examples are being updated soon.