* Increase the timeout for indexing spaces
* Allow for making queries that are not constrained to a RootID
* Use nano precision for the Mtime
* Add a SpaceDebouncer
The debouncer can be used to delay operations on spaces until things
have settled down to avoid doing the same operation multiple times.
* Do not index subtrees until they have changed (i.e. the mtime differs)
* Also pass a user to the space debouncer func
* Trigger a rescan of the according space when an event is received
* Improve wording/logging
* Add changelog
* Get rid of superfluous GetUserByClaim call
* Fix tests
* Fix reindexing triggered by shares by using the event's SpaceOwner
* Bump reva to pull in the space owner events changes
* Fix changelog
* Fix linter issues
* Fall back to the executant if no owner was received from the event
* Bump reva and go-cs3apis
* Fix go.sum
* Bump core
* Adapt expected failures
* Tweak debounce settings
This avoids using a public global variable. It allows us to initialize
the default client a bit later (outside of init()). That way we can e.g.
properly initialize the in-memory registry.
