Adding a percentage slider in the motif search for single-exec logs

[bestchai]

Currently, for logs with a single execution, the network motif search allows users to customize calculation of subgraph significance by specifying a minimum number of appearances in the execution. See Issue 138

Instead of a subgraph count, a percentage slider could be added that allows users to specify the percentage of events or edges in the execution that belong to an instance of the subgraph. One way to calculate the number of events in an execution is to iterate through the processes, find the last event in each and sum together the clock indices in their vector clocks.

[Issue created by pattypcw: 2015-08-06]