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Wendelin.core 2 will need to spawn WCFS filesystem server that accesses
the same ZODB database as the program that spawns it. The database
argument passed to WCFS is passed in the form of URL[1,2].  Even though
zodburi provides way to convert an URL into ZODB storage instance, there
is currently no way for reverse operation - to convert ZODB storage
instance into URL to access it(*). So we have to build it by our own.

Provide zstor_2zurl stub that currently works for FileStorage only.
ZEO and NEO support is TODO.

In the future we might want to move this functionality into
zodbtools/py.

[1] https://lab.nexedi.com/nexedi/zodbtools/blob/a2e4dd23/zodbtools/help.py#L27-53
[2] https://lab.nexedi.com/kirr/neo/blob/3d909114/go/zodb/zodbtools/help.go#L25-51

(*) contrary to ZODB/go where this functionality is provided out of the box:
    https://godoc.org/lab.nexedi.com/kirr/neo/go/zodb#IStorage