FileName const unzipFile(FileName const & zipped_file,
std::string const & unzipped_file = std::string());
-/// Create absolute path. If impossible, don't do anything
-std::string const expandPath(std::string const & path);
-
/** Convert relative path into absolute path based on a basepath.
If relpath is absolute, just use that.
If basepath doesn't exist use CWD.