pubs: Fellwalker - revert accidental changes committed to comp4 script
pubs: Ensure similar configs are used for 2D cf and fw, and describe them
pubs: FellWalker - another "cf splits sources" reference

Although obviously this reference makes no mention of FellWalker.
pubs: FellWalker - explain fig 5

In answer to a comment from Mark Thompson.
pubs: Fellwalker - use consistent configs for 3D tests