SeedFinderQaUpgrade

The following figures were added to CbmSeedFinderQa:

-Number of linked triggers per MC event (how any triggers received contributions)

-Number of matched triggers per MC event (how any triggers received majority contributions)

-Number of contributing MC events per trigger

-Time difference to closest MC event per trigger (doesn't use matches).

Includes commits from !735 (merged)

@v.friese @o.golosov @shreyaroy_AT_jcbose.ac.in

On edit:

Included time difference of seed times to matched MC times, for one-to-one matched cases only.