This removes the need for the statistics vstring as the specification of directing the statistics to a given destination is done via the 'enableStatistics' bool parameter.

-Both the old and new configuration APIs are supported. Having `categories` and `destinations` parameters being available trigger the old configuration handling.
-As much code as reasonably possible is shared between the two implementations.
-The ParameterSetValidation code is used for the new API but the fillDescriptions usage can not be implemented until all uses of the old configuration are removed.

Properly read the 'files' PSet
Set the correct default for lineLength
Make it so the 'default' PSet can properly set the values for destinations which do not explicitly set a parameter.

-Properly handle setting up statistics
-Set defaults to match original behavior
-Throw an exception if multiple destinations want to write to the same log file

Only the tests which explicitly created the Service were changed. Those that use the standard cfi.py file must wait until we are ready to change that file.

The ELadministrator has not been a singleton for a long time. The old code was preventing the use of std::make_shared with the class.