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Julia API, NFC: Use Cvoid instead of Nothing in ccalls

See merge request !255

and for return types in write_function. Cvoid is just an
alias for Nothing, but recommended to used in ccalls
for readability.

don't use BRep_Tool::Tolerance(TopoDS::Face(s)) to increase du, dv: this tol is in real space and can be far  too large (fixes multiple ellipse intersection test case)

- only set parametric = 1 for curves and surfaces

use closest point in reparamOnFace if curve is *not* on face ; and only issue a warning instead of an error