Feature #41: Integrate VDC multihit analysis from APEX branch
Handle drift distance sign ambiguities
One complication with analyzing VDC clusters is the ambiguity of the sign of the drift distances derived from the drift times.
Without a time offset, only the smallest drift distance is ambiguous, but when allowing an offset, more combinations are possible.
One could look for the characteristic "V shape" of drift time vs. wire number to identify the wire with the smallest drift distance ("pivot wire"). With the pivot wire identified, we can proceed as before.
A large uncertainty in the drift times might require that more possibilities are considered, for example one of the wires immediately next to the apparent pivot wire might be the real pivot instead. Whether or not this additional analysis is necessary depends on the actual value of the time uncertainty. The code could check for it.