splitting and merging lots
some conversations already exist mostly around splitting lots:
- https://github.com/valueflows/resource/issues/43#issuecomment-225447316
- https://github.com/valnet/valuenetwork/issues/504#issuecomment-225448690
I also see case where we have an input to a process and take part of it from two lot-controlled resources. One could have two events or merge resource needed for the process and have just one event. In some cases, where 'external' agent allocates resource for the process ,they would not expose their internal inventory but only create merged resource and transport it to the location of the process.