bring back F.XYZ

Mengzhen Wangrequested to merge
bring_back_F_XYZ into master

This MR is to be reviewed, ci-tested and merged together with Rec!2570 (merged).

F.X, F.Y and F.Z was commented out in !924 (merged) . Now bring them back as they are fixed in Rec!2570 (merged).

New functions are defined for vertex position, named as F.V(X, Y, Z, Rho).

Edited by Mengzhen Wang

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