+ bool extchanged(std::string const & ext) const;
+ ///
+ bool exist(support::FileName const & fil) const;
+ /// returns true if any files with ext exist
+ bool ext_exist(std::string const & ext) const;
+ ///
+ void remove_files_with_extension(std::string const &);
+ ///
+ void remove_file(support::FileName const &);