Merged l1t-packing-710pre2 from repository matz-e
Remove doubled function definition.
first version
A first implementation of packers.

For now, only the jet packer works.  A stub for CaloTowers is included, but
not filled.  This might also have to be changed to match an infrastructure
working off of links in the L1T.
Merge remote-tracking branch 'tapper/unpacker-dev' into l1t-packing-710pre2

Conflicts:
	EventFilter/L1TRawToDigi/plugins/L1TRawToDigi.cc
Assign unique (temporary) block ids to unpackers.

Needs changing as soon as their block ids are determined.
Make JetUnpacker fit for testing.

Some of these changes might have to be reverted again.  This includes
letting the number of jets in a BX float (not being fixed to 12).