Time-only timestamp support integrated

Parsing for partial timestamps that only contain the time (i.e. Basketball dataset) is now supported.
The following time-only formats are allowed:
nnn
ss
mm:ss
HH.mm.ss
ss.nnn
mm:ss.nnn
HH:mm:ss.nnn

Fix: timeLimit re-initialization now in the proper place,
so that timeLimits don't carry over between datasets

TODO(next commit): change the binning algorithm to specify the bin size (aka binning interval) instad
of total bin count - fix bin count for each series is impractical due outlier events occuring with a
large spread in time.