PSE125 holds information about setting of F250 modules. Now this
information is used to set `fNPedestalSamples` and `fNPeakSamples`
parameters of `THcRawAdcHit`.

This is done through `THcHitList`, since it has information about
which crate and module each channel is in. Currently, the information
is set for each event, because of the hitlist and analyzer design.

I added the neccessary support for these changes to all raw hit
classes.

This makes the code nicer and with less duplication in logic.

Along with that I had to correct all the call sites to the RawHodoHit in all the
classes that use it.

Added new class THcRawTdcHit.
RawShowerHit update.

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.

  Raw hit reports # of expected signals and their types (ADC vs TDC)
  Raw hit accept and deliver flash ADC sample, and pulse data
     (pulse integral, dynamic pedestal, time and peak)

  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

  Friend the detector classes that need access to the private members.
  May later want to use member functions to access the data.