The functions for assessing the heterogeneity and inconsistency in network meta-analysis, for producing a net heat plot and a network graph are now implemented in the R package netmeta with version 0.4-0 and are available from the standard CRAN repository.
Independent Path Decomposition: An R function referred to in the paper 'Visualizing inconsistency in network meta-analysis by independent path decomposition' by Krahn U, Binder H, König J (software instructions.R, function approx.R, data example).