23-jun-2007 NvE Support for locking introduced in AliAttrib and locked signal (and...

23-jun-2007 NvE Support for locking introduced in AliAttrib and locked signal (and error)
                treatment implemented in SetSignal() and SetSignalError() of AliSignal.
                Also the AliSignal copy constructor has been updated for the new locking.
24-jun-2007 NvE Treatment of TWRDaq data introduced in IceCleanHits.
07-jun-2007 GdV OM readout type also updated from the data contents in IceRoot.cxx.
08-jun-2007 GdV Support introduced in IceRoot.cxx to set the waveform binsize based on the
                info from the data of the I3 file.
08-jun-2007 NvE First attempt for TWR ADC calibration in IceCal2Root.cxx.
09-jun-2007 GdV OM 681 now also ignored in IceRoot.cxx.
21-jun-2007 GdV Trigger device and "main" trigger introduced IceRoot.cxx to provide
                the actual trigger time(s).
21-jun-2007 NvE External stop and (first) trigger time taken into account for the
                TWR waveform timebins in IceRawTWR. This will provide a better
                synchronisation of the various waveforms and consequently of the
                extracted LE values.
23-jun-2007 NvE Creation of OM slotnames "THRESH", "SENSIT" and "READOUT" deactivated in
                IceCal2Root since these values are currently not known from the available
                ascii database files. Furthermore, "READOUT" and "THRESH" are provided
                in the TWR (raw) data themselves and having them as empty database entries
                resulted in overwriting of the (raw) data values by the empty dbase ones.
                In case in the future one wants to provide default dbase values, which
                might be overwritten by values from the data themselves, on should "lock"
                the signal values from the data using the newly introduced locking facility
                of AliAttrib and AliSignal.
                Also all slots in IceCal2Root now created via the "AddSlotName" facility
                and slot access exclusively via the slotname, to enhance flexibility.