fix guide position in 3d plots in GR

[daschw]

Changes

to

[daschw]

also fixed z axis guide rotation now

[ptoche]

Isn't the z label supposed to be rotated in the following? Thanks.

using Plots
gr()  # just in case
t = range(0, 8π, length = 100)
x = t .* map(cos, t)
y = (0.1t) .* map(sin, t)
z = 1:100
plot(x, y, z, xlabel = "x", ylabel = "y", zlabel = "z")