XD-1961: Hide hidden module option info by default

Tweak listeners module option doc
XD-1990: Cross reference Shell and ShellReference
XD-1749 un-ignored MessageStoreBenchmarkTests

The test had been ignored and therefore became out-of-date (i.e. it no longer worked).

The test does not contain any asserts for benchmarking (i.e. it does not assert any performance thresholds).
It only prints out the time spent within each execution.

The following vars can be updated for benchmarking:
* EXECUTIONS_PER_STORE_TYPE
* MESSAGE_GROUPS_PER_EXECUTION
* MESSAGES_PER_GROUP

It is useful as a test for the aggregator processor itself, exercising each message store type.

Also updated the aggregator processor so that it uses the correct Redis client lib (Jedis, no longer Lettuce).

test log4j Polishing
XD-1749b - Change String to Number converter to not map empty string to null.

- Added remaining tests from Spring Batch's DefaultFieldSetTests