Add 'showAbstractStates' varible to $$options

[guytish]

It will be very nice to expose this to the configuration.
Abstract states should not be clickable as same as current state.

[ncuillery]

It seems possible. The only question I ask is: Is it useful ?

Have you faced a context where such an option could have been used ?

[guytish]

From my end, I think it's very useful.
I believe you need to expose as much as possible for more powerfull and generic module.

[ncuillery]

With this option set to true, a breadcrumb could look like that:

Home / Clickable state / Unclickable state / Another state / Last state

I have never seen a breadcrumb like this...

Moreover, you can already customize the breadcrumb by using an external template (if you want a breadcrumb starting with an unclickable label for example).

My primary objective is to protect the consistency of the module, not to make it working with every twisted situations.

Feel free to tell me I'm wrong by giving me an example where such an option is useful.