No more events deduplication

Having the orders tree behing breadth first searched is already a good step, but events deduplication will not be an actual progress:
It deals only with same-frame-events, and might sometimes make more bads than goods...
Removed binder, added child
Fix #61: Adds a #go method to skip frame injection

I also removed the unused "now" argument from the #addOrder method.
This #go solution is not necessarily definitive, since we will add the possibility to forget all that and have the whole orders trees being depth first parsed (the "naive" way).