Changes in STEER:

Changes in STEER:

      * If the number of detectors is set to 0 (zero) in AliFMDMap, it
        will assume that the data contained is 51,200 entries -
        corresponding exactly to the number of channels in the FMD.
        This is the default mode of operation for most maps - in
        particular the multiplicity map of AliESDFMD.   Before, one
        would specify 3 detectors, 2 rings, 40 sectors, and 512 strips,
        resulting in 3*2*40*512=122880 entries - or 71680 entries that
        would never be used.  This change will effectively more than
        half the amount of memory used by AliESDFMD.
      * Implemented the member function AliFMDMap::CalcCoords to go from
        array index to detector coordinates
        (detector,ring,sector,strip).
      * Implemented *=, /=, +=, and -= between AliFMDMap objects, and
        *, /, +, and - operators that return an AliFMDFloatMap object.
        The implementation will access the contained arrays sequentially
        for optimal speed (unrolled nested loops).   This would allow us
        to the ADC->Energy conversion like

                energy = (adc - pedestal) * gain

        where energy, adc, pedestal, and gain are all AliFMDFloatMap
        objects.  Special care is taken if the maps do not have the same
        dimensions.
      * Implemented AliFMDMap::ForEach that takes an object of a
        sub-class of AliFMDMap::ForOne and applies the relevant
        functional operator to each element.  The internal array is
        accessed sequentially for optimal speed (unrolled nested
        loops).
      * Define AliESDFMD::ForEach that will loop over all entries and
        apply the functional operator of the supplied object of a
        sub-class of AliESDFMD::ForOne to each element in turn.  The
        loop is unrolled.

Changes in FMD:

      * AliFMD***Map now defaults to construct with exactly 51200
        entries.  Maps with fewer entries can still be made (like
        before) by explicit use of constructor arguments.
      * Calibration and digitizer code constructs AliFMD***Map with
        minimal sizes needed.

These changes committed by Peter HRISTOV on behalf of Christian Holm
Christensen.