Factored ObjectPool out for general pattern of having a pool of worker items that needs to be disposed in the 'last one out - shuts the lights' fashion.
Added lazy FileStream creation up to max limit into TFChunk.
EpochManager provides ability to check for existing of specified epoch at give LogPosition.
Removed MultiCheckpoints.
Added updating of EpochManager on replication.
Added waiting for chaser caught up into Single-node version (in single-node mode is useful still on initial start-up to update EpochManager, if needed.
TcpService as internal/external. BadRequest handling with shutting down node in TcpConnectionManager. Better intermediate output for WRFL.