Changeset 815:aef153f430e1 in lemon-1.2 for doc

Entirely rework cycle canceling algorithms (#180)

• Move the cycle canceling algorithms (CycleCanceling?, CancelAndTighten?) into one class (CycleCanceling?).
• Add a Method parameter to the run() function to be able to select the used cycle canceling method.
• Use the new interface similarly to NetworkSimplex?.
• Rework the implementations using an efficient internal structure for handling the residual network. This improvement made the codes much faster.
• Handle GEQ supply type (LEQ is not supported).
• Handle infinite upper bounds.
• Handle negative costs (for arcs of finite upper bound).
• Extend the documentation.