- singleton functionality added for component and configuration handler

- singleton functionality added for component and configuration handler
- support for multiple instances of AliHLTSystem
- HLTOUT processing policy moved from block-oriented to handler-oriented, one
  handler can now serve multiple data blocks but gets called only once
- added Reset method to AliHLTOUT class in order to use the same object for
  multiple events
- preparations for the HLTOUT kChain implementation, not yet finished