#12 Couple of improvements to animator

[sierra]

It would be nice if there was a possibility to loop chosen camera path track, so that it repeats the track for example two times before moving on to the next camera path track. Another nice feature would be the possibility to copy camera path to other camera path track. Example using those two new features: cell is shown from the first time point of the time series, then cell rotates 2-3 times along y-axis (or some custom camera path), then stops and next, the time series track shows cell from one fixed angle goes through all time points, then the next track would again show cell, this time in the last time point, rotating along same path as in the first time point.