Initialized the key mapping to integers, and
 the list of raw data defined in the database.
 The database defines the channel mapping, but the
 keys in the database must match the fKeyToIdx map.
 Set up rotated BPMs.
 Some devices like 'bpm', 'bcm', 'lumi' can be tied
 to others like 'adc', 'scaler' according to rules.

To potentially add this device to the list of derived types.
 Note, e.g. "bpm" can be tied to an "adc", but not vice versa.

 Find the pointer to the header for the various devices.
 The "fundamental" devices are ADC, SCALER, TIMEBOARD, TIR.
roc==0 is an error and probably means CODA is not set up
 correctly. Although roc==0 is logically possible in CODA
 it is forbidden because of database conventions.

  Printout for debugging multiroc decoding.

Build default list of rotated BPMs.
 BPMs listed here are rotated by 45 degrees.  The others are not
 rotated, they are up/down.  This can be over-ridden by the
 database:  by convention a device-name (3rd column) can have
 suffix "_r" or "_ur" to force rotation or unrotation.  Leaving
 out this suffix will result in the default behavior here.
 The suffix "_r" or "_ur" are otherwise IGNORED.
Example of device-name in db file:
     "bpm8"    --> rotated (default here)
     "bpm8_r"  --> still rotated
     "bpm8_ur" --> unrotated.

 Add a key to the list of raw data.

 Returns the integer key corresponding to the string key name.
 Users of this class who have a list of string keys should upon
initialization of the code call this method to determine the
corresponding list of integer keys.  Then use those integers.
 The string keys are still useful, however, to define names of
variables in the tree, and to initialize datamap from database,
 but one should *NOT* use this method inside an event loop !!

 Return a pointer to the raw ADC or SCALER data corresponding to key

 Return a pointer to the calibrated ADC or SCALER data corresponding to key

 Return a pointer to the corrected ADC or SCALER data
  (before pedestal subtraction) corresponding to key

 Initialize the mapping between key names and integers.
 Users of device data should access the data using the integer keys.
 Example of how to get data:
GetData(IBCM1R);

 I tried to anticipate all future devices, but if you need
 to add a new one, put it here (another 'insert' line) and
 define the key in DevTypes.hh (genDevTypes.pl)