show more information in "pause" tab

[chewiebug]

GCViewer 1.29 shows some metrics about pauses occurred in the gc log file. It would be interesting to have more information about pauses:

sum / min / max / avg pause values not only for all pauses but separately for

• gc pauses (all non full gc pauses)
• full gc pauses

[chewiebug]

GCViewer shows sum, number, avg, min and max pause for all / gc / full gc events. Additionally for all pauses the avg / min / max pause interval is shown (G1 tuning relies partly on setting values for pause intervals).