Small fix in linear Radon transform
Small fix in linear Radon transform

Force href = 1 if order = "linear"
WneleiGao/Seismic.jl,JuliaPackageMirrors/Seismic.jl,juanisabbione/Seismic.jl,SeismicJulia/Seismic.jl,fercarozzi/Seismic.jl,fercarozzi/myseismicjulia