Fixed point should be 1
The flows should look like -0.5 0.5 -0.5 0.5...
Test the helpedr functions
_mod_pi(even_multiple_of_pi)==0
_mod_pi(odd_multiple_of_pi)==+/- 1
checks omega of a ring network with equispaced thetas
this function should return angles with |successive difference| < pi/2
Fixed point should be 1