An Ibex module with geometrical features

This packages gathers developpement around then polar constraint which links Cartesian and Polar coordinates. It contains :

• bwd_angle : the elementary backward operation for atan2 ( without modulo 2*pi )
• CtcAngle : A Forward/Backward contractor for the relation th = atan2(y, x)
• Catan2 : other implementation of CtcAngle with tests [NEW]
• CtcPolar : A Minimal contractor for the constraint x = rhocos(theta), y = rhosin(theta)
• SepPolarXY : separator for the projection of the polar constraint on the XY plan

mkdir -p build && cd build
cmake -DWITH_PYTHON=OFF  ..
make

bwd_angle, CtcAngle