The -d option will prevent the cleaning of the unpacked source code.
+To improve:
+
+ * The runtime dependencies for Rgraphviz are outdated (there is no libraphviz4
+ any more). To get the package run (theoretically) this was not changed
+ to "alias_run libgraphviz libgraphviz-dev" but this can certainly be
+ optimised.
+
Concerning data/:
This contains scripts necessary to recreate the database should you lose the