hodoscope start time.

Pass a start time computed in THcHodoscope to THcDriftChamberPlane. A dummy value for the start time is used until the Hodoscope code actually computes the start time.

    Define constants (e.g. plane counts) that are not defined in
    the ENGINE parameter files so that the detector classes
    can be more generic.
    Hodoscope and Aerogel now pick up plane and tube counts from this file

      Start adding to the drift chamber code.   Setup a class structure
      similar to what podd uses for the VDCs.  Raw hit class renamed
      to THcRawDCHit.  Signal hits are how THcDCHit, modeled after
      podd hits.  Add THcDCWire, and classes for time to distance conversion.
      Time to distnace conversion doesn't do anything yet.

      Find some improved DC parameter files so that min and max TDC limits
      are good for the run we are using.

      THcDriftChamberPlane asks ThcDriftChamber for many parameters.

xhodo.pos and xhodo.param
THcHodoscope generally holds:
- singular variables (i.e. central path through the spectrometer, min/max limits for the ADCs, TDCs, etc.)
- "padded arrays" (i.e. look at the plane with the most scintillators, allocate and array that has max_no_scint * no_of_planes - these are mostly found in the .param file)
THcScintillatorPlane generally holds:
- simple variables containing plane-specific info (z-position, scintillator size and spacing)
- arrays sized appropirately for the specific plane (i.e. individual x (or y) positions for all scintillators in a plane, signal propagation speed in the paddle, etc.)

    Register some more variables for the tree
    Clear fNelem of some arrays, not fNhits.
    Print method to print Aerogel pedestals.
    Make Pedestal analysis a bit more like the ENGINE.
    Initialize counters

Added haero.param to general.param.

locations (e.g. via rpm) instead of under a common ROOTSYS.

Change shower plane names from 1z, 2z, 3z, 4z to 1pr, 2ta, 3ta, 4ta
  to match the names used in the parameters.
Fix up histogram names for new plane names.
Get rid of duplicate THaNonTrackingDetector::Init call.

Use DBRequest inside of loops over planes, using Form
to construct variables names that have the plane lable in them
(e.g. 1x, 1y, 2x, 2y)

prepended to all variables in the DBRequest list.

detector parameters from the gHcParms (THcParmList).

pedestal event analysis at Decode, no cut needed on histograms need to assure
that events with HMS (evtype 1 and 3) get histogrammed.

Use cut file to determine what is a pedestal event.  Pedestal events
only proceed to Decode.
In Decode (Just THcHodoscope for now) loop through each plane and accumulate
pedestal data.  Calculate the pedestals at the first non-pedestal event.
Pedestals are just calculated, but nothing is done with them.

don't add to histograms.

1) Add test for root version when filling sighit1
2) Fixed line which had wrong order in Set and needed two integer values
   sighit1->Set(1,(Int_t)(hit->fADC_pos - 470.7));

to the (Hall C ENGINE style) map file being used.

Put map files in MAPS subdir.
Define correct map for run 50017 in test.database.
Add a script to display drift chamber hitmaps.
Fix make_cratemap.pl so that it makes an entry in db_cratemap.dat
  for all Fastbus slots.

use the run number to determine which parameter and map files to use.

string variables from the Hall C style parameter files.  String
variables are loaded into a THaTextvars object that is held in the
THcParmList object.  PrintFull will now print all the string variables
as well as the numerical variables.  Added GetString, AddString and
RemoveString methods to access and modify the string variables.

for older ROOT version wasn't working.