DNA 2.0 beta 25

Changes since the last release:

• Added a new dna_multiclust function, which applies a dozen clustering and community detection techniques to a discourse network and computes modularity, for a single network or a time-window series of networks. If a time-window series of networks is used, the largest modularity score of all cluster solutions is saved in a separate list and can be plotted as a curve using the new dna_plotModularity function.
• Removed the dna_timeWindow function because its functionality is replaced by dna_multiclust and dna_plotModularity.
• Added a new dna_dendrogram function, which computes the cluster solution with the highest modularity using the dna_multiclust function and then plots a dendrogram for this cluster solution. It is also possible to set various colors and other settings for the dendrogram easily.
• Added a new dna_polarization function, which applies a genetic algorithm to find the extent of polarization in a discourse network or a time-window series of networks. If a time-window series of networks is used to compute polarization, the new dna_plotPolarization function can plot a) a curve for the polarization measure over time and b) convergence diagnostics of the genetic algorithm.
• Stress majorization is now used as the default network layout in dna_plotNetwork, following changes in the ggraph and graphlayouts packages.
• Some bugfixes.