Merged l1t-devel-CMSSW_7_1_4_patch1 from repository cms-l1t-offline
update protection on missing collections
new config with stage2 cal
Merged l1t-devel-CMSSW_7_1_4_patch1 from repository cms-l1t-offline
Update Tau and EG iso algorithms to use 12x12s instead of jets
Move the plugin headers into the source files.
Remove hard-coded header and trailer lenghts.
Hook up (un)packer in the calo emulation.

Conflicts:
	L1Trigger/L1TCalorimeter/test/SimL1Emulator_Stage1.py
Produce collections even if the unpacking fails.

Required a reworking of the unpacker factory interface, which now includes
{begin,end}Event methods to create new collections and put them into the
event.