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DESCRIPTION:
this function interpolate y use parabol splines
f for case of ...
TESTs:
d=sp.splineParab(points=[0,1,2,3,4],y=[0,0,1,0,0])
a0,a1,a2,a3=d[(0,1)]
p0,g,h,p1=d[(0,0)]
plt.plot(a0,p0(a0),a1,g(a1),a2,h(a2),a3,p1(a3))
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DESCRIPTION:
find parabols equations g,h in points listX
from that restrictions:
g(x0)=p0(x0)
g'(x0)=p0'(x0)
h(x1)=p1(x1)
h'(x1)=p1'(x1)
g(xHalf)=h(xHalf)
g'(xHalf)=h'(xHalf)
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