readout points

[GaelTouquet]

-Add readout points in Patterns, expecially spherical ones

-add method in spherical pattern to turn each point in interleaf into a list of points starting with the point that was there and add other points following spherical computation

-Made the computation once, still there somewhere? was it before using git?

[GaelTouquet]

checks:
-point timing
-alternation

[GaelTouquet]

for point timing: ask Monica if it is 6ms per spoke or per readout