I've added a new method (-1) for merging traces in stream objects.
This operation only merges traces that have common parts with exactly
the same data content (e.g. duplicated traces) or are directly adjacent
to each other. All other traces are left alone (i.e. no traces with
msked arrays at gaps and so on).
It can be useful in further data analysis e.g. if the data comes from
two files but is without actual gaps or if a server returns duplicated
The default stays at stream.merge(method=0).
See e.g. commit 2241 for more information.