+typedef std::list<std::string> StringList;
+typedef std::list<Msp::FS::Path> PathList;
+typedef std::map<std::string, std::string> StringMap;
+
+/** Runs a command and returns its output as a string. The exit status of the
+command is returned in the second parameter if it is not null. */
+std::string run_command(const StringList &, int * =0);