Introduced tree caching and async reading for data (ESD and AOD) and MC. An read...

Introduced tree caching and async reading for data (ESD and AOD) and MC. An read input cache of 100MB is created by default. To change it: mgr->SetCacheSize(bytes) (0=no cache). For MC, caches can be used for the kinematics and track references trees. The cache sizes are the same as set to the manager (default 100 MB) but can be set separately via mchandler->SetCacheSize(bytes). For MC, this should be used with the particle prefetching option on: mchandler->SetPreReadMode(AliMCEventHandler::kLmPreRead). The update is VERY important and can gain factors ranging from 1.2 to 40 in the analysis speed when reading data via high latency network.