Pair Critical Points and Compute Persistent Homology of Reeb Graphs // Interface to the 'ReebGraphPairing' program to compute critical points of Reeb graphs following Tu, Hajij, Rosen (2019) doi:10.1007/978-3-030-33720-9_8 via the 'rJava' package. Also store Reeb graphs in a minimal S3 class, convert between other network data structures, and post-process pairing data to obtain extended persistent homology following Carrire Oudot (2018) doi:10.1007/s10208-017-9370-z.