ill_upwards: - collection node must be there, size column must start at 0@0 (collection node)   this is checked and thus guaranteed.   thus the stack+1 needed to have a bound that is <root is no longer necessary,   as the smallest root is now 1@0 - small efficiency improvement in processing of context nodes
ill_upwards:
- collection node must be there, size column must start at 0@0 (collection node)
  this is checked and thus guaranteed.
  thus the stack+1 needed to have a bound that is <root is no longer necessary,
  as the smallest root is now 1@0
- small efficiency improvement in processing of context nodes

pf_support:
- remove slice hack to prevent troubles caused by collection nodes (no longer required)
- chk_order on ll_upwards input (item,iter)e

pathfinder.mx
- create a collection node also in the transient document container
  this is just a dummy node. so ll_upwards also works on transient nodes.

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb