bugfix: correction to the interface of stream obj

The datatype of the argument to SetiMaxFileSize() was too small and
could overflow.
The SetMaxFileSize() interface wasn't used at all (possibly confused
with SetiMaxFileSize()) and was dropped.
doc: mention queue file size patch
Merge branch 'v5-stable' into tmp
Merge branch 'v6-stable' into tmp
doc: mention queue file size patch