EMC simulation status

Brief comments in the absence of an EMC speaker...

• Geometry code is stable; cleanup of gnemca to clean out obsolete versions of the geometry is pending
• Hit definition is stable. No XDR file changes planned
• Digitization is done in C++. New package EmcSim from Phil Strother recently committed creates digitizations from GHits. Modules:

  EmcGHitsToWaveform

  Generates ADC waveforms from GHit list, adds electronic noise. Output is EmcWaveform objects.

  EmcWaveformsToDigis

  Feature extraction either via simple maximum around the peak or using digital filtering (BaBar note #274). Feature extracted energy is loaded into digis.

  Two-step process with split at the Waveform stage is because trigger interface may be needed at this stage.