Added new class THcRawTdcHit.
RawShowerHit update.

The f250 modules can produce at most 511 samples (9 bit) so it seemed reasonable to increase
the maximum number of samples in the raw hits to this value.

As it turns out, this was not so easy fix. I had to do:
- add at least c++0x support to scons (works for g++ 4.4.7!)
- change how my DefineVariables works

The c++0x support is bonus, since now we can use some additional features, like auto keyword (see https://gcc.gnu.org/gcc-4.4/cxx0x_status.html).

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.

- Now throwing an error for invalid signal in THcRawHodoHit::GetRawData and THcRawHodoHit::GetData.
- THcRawHodoHit::GetData now only subtracts reference time for TDC channels.
- THcRawHodoHit::SetReference now prints warning when trying to set reference time for ADC and does not set it.
- Fix in THcTrigRawHit::Clear to set fHasMulti to kFALSE.
- THcTrigRawHit::SetReference now prints warning when trying to set reference time for ADC and does not set it.

Modified THcTrigRawHit.
Modified THcTrigDet.
Updated documentation.

Dummy spectrometer class.
Added a dummy spectrometer class to ease the construction of teststands for single detectors.

  Use xhodo_adc_mode to choose how to interpret data
    0 - Interpret as a standard ADC, subtracting pedestal found from ped events
    1 - Use integrated pulse from ADC.  Subtract the event by ev pedestal
    2 - Integrate the sample data, subtract ped found from ped events
    3 - Integrate the sample data, subtract dynamic pedestal
  xhodo_pedestal_scale is factor to multiply dynamic pedestal before
    subtracting.  For example, if uses 4 samples to get pedestal and
    is acquiring 86 samples, in mode 3, this should be 86/4
  xhodo_adc_diag_cut is a cut used to determine if diagnostic ADC
    stuff should be put in tree for each channel.  Need to set this so
    that hodoscope hitmaps get filled right.  Was 50 for Fastbus data.

  Get this information if hit says it is looking for ADC info
  and the module reports that it is multifunction

  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)

  Don't check if UInt_t's are >=0
  Remove unused/repeated variables
  Cast enums to Int_t in switch statements
  Initialize temp variables

THcParmList::LoadParmValues now throws runtime_error instead of calling Fatal,
and with that causing core dump, when non-optional parameter is not found.

  Otherwise InitHistlist doesn't have the detector map
  and can't do setup of reference time stuff or sanity checks on the
  detector mapping

Some detector classes lacked the ability to get the appropriate
Apparatus character and were only working for HMS.

- Added range checks when adding data to hits. Now an error
is thrown instead of potentially getting core dump.

in THcDrifthChamberPlane::DefineVariable and output.def

Fixed mistake in calculating focal plane time from hodoscope
Change to check if hit has a corrected time.
Then change to use GetPosTOFCorrectedTime instead of GetPosCorrectedTime
and same for neg

  Default is to use new "invadc" parameters.  Use old style
  by setting Xtofusinginvadc=0

  in THcHodoscope

   in THcHodoscope::FineProcess

Lot's of changes to
 THcScintillator::ProcessHits
 THcHodoscope::EstimateFocalPlaneTimes
 THcHodoscope::FineProcess

  Replace > with >= so fGoodScinHits can get set

  Add a new parameter Xaero_tdc_offset to make sure valid tdc
  hits from a reference time corrected tdc are positive.
  Accept first first positve tdc hit after applying offset.
  Move array filling in CoarseProcess into Decode

  THcRawHodoHit gives reference time corrected TDC values
  THcScintillator plane adds a per plane offset to the raw tdc value
  First positive TDC value after adding offset is used