- Added new leafs to the hodoscope tree.
 - Added new leafs to the aerogel tree.
 - Added new leafs to cerenkov tree.
 - Added new leafs to the shower tree.

Left all the old leafs in there. Will need a careful cleanup...

The new class THcRawAdcHit is meant to represent the raw ADC hits. The
logic with dealing with ADCs has become quite complex now and it would
have to be multiplicated across all detectors that have ADC
channels. While this by itself is not such a big problem, fixing
possible bugs in multiple places is.

I also redesigned the THcRawShowerHit class to use the new
THcRawAdcHit. The redesign was due anyway, so I took the opportunity.

I also had to modify THcShowerArray and THcShowerPlane. They still
need some work to use the the new flash 250 data, but changes were
necessary anyway.

Minor fix 01.

    shms-calo-test directory comprises codes for testing. The 1-st
    layer of SOS calorimeter mimicks the SHMS Preshower, and positive
    side of the 2-nd layer mimicks fly's eye part.

fly's eye part.

from SHMS shower counter. Make THcShowerArray a friend class to
THcShower in order to have access to the debug flags.

  Enable by defining HITPIC in THcShowerArray.h

  GetData accepts a pedestal range and an integration range.
  Samples in the integration range are added after subtracting the
  average of the pedestal range from each sample.
  Method also provided to return dynamic pedestal

  A shower counter hit can now be multiple samples, with a different
  number of samples allowed for positive and negative tubes.
  GetData(signal) now returns the sum of all the samples.  This should
  still be compatible with fastbus ADCs as they are a single sample
  (which is already the integral.)

  Added as an optional sub detector THcShowerArray to the THcShower class
  Get hit data with GetData method instead of hit member variables
    so as to be compatible with FADC compatible hit list