class THaScaler: public TObject

 Set up the scaler banks.  Each bank is a group of related scalers.
 'bankgr' is group of scaler banks, "Left"(L-arm), "Right"(R-arm), etc

 Initialize scalers for given date/time.
 Accuracy is 1 day. Only date is used, time is ignored.

 Init() is required to be run once in the life of object.
 'thetime' is the Day-Month-Year to look up scaler map related to data.
 e.g. thetime = '21-05-1999' --> 21st of May 1999.
 'thetime' can also be "now"

 Initialize data of the class for this bankgroup for the date wanted.
 While in principle this should come from a "database", it basically
 never changes.  However, to add a new scaler bank, imitate what is
 done for "Left" or "Right" HRS.
 Note: this routine must be called after database is new'd but
 before it is loaded.

 definition of "clock" in the scaler.map file.  If this is
 not called, then the "clock" is defined by scaler.map

 Set the average time interval between events.
 Note, use this *ONLY IF* there is no clock in the datastream.

 Load data from THaEvData object.  Return of 0 is ok.
 Note: GetEvBuffer is no faster than evdata.Get...

 from CODA file 'filename'.  We'll open it for you. Return of 0 is ok.

 from CODA file 'filename'.  We'll open it for you. Return of 0 is ok.

 Load data from a CODA file, assumed to be already opened.
 Return of 0 means end of data, return of 1 means there is more data.

 Extract rawdata from data if this event belongs to this scaler crate.
 This works for CODA event data or VME data format but not
 for scaler history file (strings).

 Load data from scaler history file for run number

 Load data from scaler history file 'filename' for run number run_num

 Load data from online VME server and port for this 'Bank Group'

 Load data from VME 'server' and 'port'.

 Print data contents

 Print out a summary of important scalers

 Get data by slot and channel.  This is the FASTEST method.
 Histor = 0 = present event.  Histor = 1 = previous event

 Accum. counts on PMTs of detector = "s1", "s2", "gasc", "a1", "a2",
 "leadgl", "edtm".   PMT = "left" or "right" or "LR"

 Non-helicity gated trigger counts for trig# 1,2,3...

 Accum. counts for trig# 1,2,3,4,5, etc
 by helcity state (-1, 0, +1)  where 0 is non-helicity gated
 histor = 0 = this event.  1 = previous event.

 Non-helicity gated BCM counts for 'which' = 'bcm_u1','bcm_d1',
 'bcm_u3','bcm_d3','bcm_u10','bcm_d10'

 Get BCM counts for 'which' = 'bcm_u1','bcm_d1',
 'bcm_u3','bcm_d3','bcm_u10','bcm_d10'
 by helcity state (-1, 0, +1)  where 0 is non-helicity gated
 histor = 0 = this event.  1 = previous event.

 Obtain pulser values, by 'which' = 'clock', 'edt', 'edtat', 'strobe', etc

 Get Normalization Data for channel 'which'
 by target and helcity states 0, 1, -1  where 0 is neither
 histor = 0 = this event.  1 = previous event.

 Get Normalization Data for channel 'which'
 by helcity state (-1, 0, +1)  where 0 is non-helicity gated
 histor = 0 = this event.  1 = previous event.

 Get Normalization Data for channel #chan = 0,1,2,...
 by target and helcity state (-1, 0, +1)  where 0 is neither
 histor = 0 = this event.  1 = previous event.
 Assumption: a slot with "TS-accept" is a normalization scaler.

 Get Normalization Data for channel #chan = 0,1,2,...
 by helcity state (-1, 0, +1)  where 0 is non-helicity gated
 histor = 0 = this event.  1 = previous event.
 Assumption: a slot with "TS-accept" is a normalization scaler.

 No distinction by target state because it's assumed that diff tgt states
 share the same channel map since that's how we fan out the signals.

 Return rates on scaler data, for slot #slot, channel #chan

 Rates (Hz) since last update for detector 's1', 's2', 'gasC', etc
 PMT = "left", "right", "LR" (coinc),  and channel #chan.

 Get the time difference in seconds based on a clock
 in (slot, chan).  Normally chan=7.
 See also comments in GetTimeDiff

 Get the time difference in seconds.  Must normalize to a clock.
 If we have "SetClockLoc" then we use the location it defined.
 Otherwise we use the clock location from the "clock" item in
 the scaler.map file (which is the usual way).

 Get time diff for target state 'tgtstate' and helicity.
 See overloaded implementation for comments.

 Utility to convert string header to base 16 integer

 Constructors.
 'Bankgroup' is collection of scalers, "Left"(L-arm), "Right"(R-arm)
  "EvLeft" = event stream, Left HRS,  "EvRight" = event stream, Right HRS.