WP Formulation: constraint_compressor_energy

[rb004f]

WP Formulation: constraint_compressor_energy - this constraint appears to assume f is positive.

[rb004f]

probably just use abs(f) in the constraint

[skylerreid]

clarification: this constraint has been properly integrated for the nonlinear problems (WP, DWP) but not for the linear or convex relaxations. see function constraint_compressor_energy in crdwp.jl, lrdwp.jl, and lrwp.jl