melvidoni/rsppfp: rsppfp v1.0.3

Stable release of advanced implementation of rsppfp, with minor bug fixes. Released November 2018.

• Additional checks have been added to Hsu's and Villeneuve's transformation. The algorithms now stop if certain conditions are not met, such as: columns' names, use of non-existent nodes in forbidden paths, and subpaths inclusions for Villeneuve's algorithms.
• Additional handling of the weight has been added to the convenience function get_shortest_path(). The user is now required to explicit the weight attribute name. If it does not exist, a standard weight of 1 is added to the graph.
• All examples and documentation now feature data frames created with data.frame(), instead of using structure() The importance of using stringsAsFactors = FALSE has been highlighted.
• Cluster closing has been moved to on.exit(), so that if the function terminates early, all the connections will still be closed.
• The benchmark on the website now showcases the results for all the evaluated density types.