Network visualization functions

• writetoPAJ.m (BD, BU networks).
  A function that converts matlab connection matrices into Pajek-compatible format.
  Contributor: CH.
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• reorderMAT.m (WD, WU, BD, BU networks).
  A reordering algorithm that permutes rows and columns of a matrix in order to force matrix elements with high values near the main diagonal – this often helps in displaying community structure, clusters, and the like.
  Contributor: OS.
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• An alternative way to visualize the network is to reorder the nodes by community structure (see 'Modularity' in Network Metrics).