warmer test to use 0 replicas
they are meaningless in the context of the test, should stabilize it
Ported an 0.90 branch excplicit test for dynamic update of gc_delete setting for RobinEngine.
This issue is already solved in master.

See #3396
Solved test timing issue and removed meaningless test
Added source fetching and filtering parameters to search, get, multi-get, get-source and explain requests

Closes #3301
Added prefix suggestions based on AnalyzingSuggester

This commit introduces near realtime suggestions. For more information about
its usage refer to github issue #3376

From the implementation point of view, a custom AnalyzingSuggester is used
in combination with a custom postingsformat (which is not exposed to the user
anywhere for him to use).
fixed bug related to preserveSep and beefed up tests
fixed comments from adrien