- Fix problem with working set serialization. The code here was not complete,   only the document at position 1 could be main document to be serialized.
- Fix problem with working set serialization. The code here was not complete,
  only the document at position 1 could be main document to be serialized.

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