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DPL: add DataSpecUtils::getOptionalSubSpec API

This will become more meaningful once we migrate to the new OutputSpec, but for
now it should allow QC to migrate away from accessing OutputSpec details.

Framework: add LOGF, O2DEBUG, O2INFO and O2ERROR

This introduces a new header file, Framework/Logger.h which should
be used for any AliceO2 logging needs.

In the simple case, this simply forwards the API provided by FairLogger.

In addition it provides a generic LOGF macro to produce log messages
using a printf like formatting API. When available FairLogger is
actually used to do the printing and fmt is used to do the formatting.

Extra convenience macros O2DEBUG, O2INFO, O2ERROR are provided to save
a few keystrokes.

DPL: remove debug printouts

Substitute them with LOG(DEBUG) or O2_SIGNPOST where it makes sense.

Extra error check: tracks jumps in CRU RDH.packetCounter

+ some rearrangement of data members

Extra error check: tracks jumps in CRU RDH.packetCounter

+ some rearrangement of data members

Extra error check: tracks jumps in CRU RDH.packetCounter

+ some rearrangement of data members

Extra error check: tracks jumps in CRU RDH.packetCounter

+ some rearrangement of data members