Permutation of initial conditions to initial puncture order.

[mbudisic]

When converting a set of trajectories to a braid, the projection step may result in the permutation of trajectories. This is currently stored internally in colorbraiding [see here] but I can't figure out how to pass it out to the user. The problem is that constructors can only return a single argument and I am not sure that I want to attach yet another property to braid and databraid objects.

[mbudisic]

Here's the branch for this issue

[jeanluct]

This is a good point. We should discuss this carefully.