Endless loop with 0_tiny.clans and Linkage Clustering

[MartinGuehmann]

To reproduce:

Load: clans/tests/data/0_tiny.clans

Open the Clustering Window: Window -> find clusters

Select: Linkage clustering, minimum links = 2, and min. sequences per cluster = 2

Hit OK and it will run forever and is printing dots at the command line. The code responsible for that is in ClusterDetection.multilinkage. The problem is already present with #1, which just adds a bash file for compiling, but does not actually modify any files.

Considering that Convex clustering gives the result on that data immediately, which is supposed to be slow, this must be a bug.