MoneyNetworkAPI. add z_file_delete wrapper

[jaros1]

See https://github.com/HelloZeroNet/ZeroNet/issues/1140

                                            // issue #1140. https://github.com/HelloZeroNet/ZeroNet/issues/1140
                                            // false Delete error: [Errno 2] No such file or directory error returned from fileDelete
                                            // step 1: check file before delete operation
                                            debug_seq1 = MoneyNetworkAPILib.debug_z_api_operation_start(pgm, inner_path, 'fileGet');
                                            MoneyNetworkAPILib.z_file_get(pgm, {inner_path: inner_path, required: false, timeout: 1}, function (res1) {
                                                var pgm = service + '.create_sessions.step_3_find_old_outgoing_files.delete_file z_file_get callback 1: ';
                                                var debug_seq2;
                                                MoneyNetworkAPILib.debug_z_api_operation_end(debug_seq1, res1 ? 'OK' : 'Not found');
                                                if (!res1) {
                                                    console.log(pgm + 'warning. optional file ' + inner_path + ' was not found');
                                                    // continue with next file
                                                    delete_failed.push(filename) ;
                                                    delete_file(transaction_timestamp);
                                                    return;
                                                }
                                                // step 2: fileDelete
                                                debug_seq2 = MoneyNetworkAPILib.debug_z_api_operation_start(pgm, inner_path, 'fileDelete');
                                                ZeroFrame.cmd("fileDelete", inner_path, function (res2) {
                                                    var pgm = service + '.create_sessions.step_3_find_old_outgoing_files.delete_file fileDelete callback 2: ';
                                                    var debug_seq3;
                                                    if ((res2 == 'ok') || (!res2.error.match(/No such file or directory/))) {
                                                        MoneyNetworkAPILib.debug_z_api_operation_end(debug_seq2, res2 == 'ok' ? 'OK' : 'Failed. error = ' + JSON.stringify(res2));
                                                        // continue with next file
                                                        delete_file(transaction_timestamp);
                                                        return;
                                                    }
                                                    // step 3: check file after fileDelete
                                                    // fileDelete returned No such file or directory. Recheck that file has been deleted
                                                    console.log(pgm + 'issue 1140. https://github.com/HelloZeroNet/ZeroNet/issues/1140. step 2 FileDelete returned No such file or directory');
                                                    debug_seq3 = MoneyNetworkAPILib.debug_z_api_operation_start(pgm, inner_path, 'fileGet');
                                                    MoneyNetworkAPILib.z_file_get(pgm, {inner_path: inner_path, required: false, timeout: 1}, function (res3) {
                                                        var pgm = service + '.create_sessions.step_3_find_old_outgoing_files.delete_file fileGet callback 3: ';
                                                        MoneyNetworkAPILib.debug_z_api_operation_end(debug_seq3, res3 ? 'OK' : 'Not found');
                                                        if (!res3) {
                                                            // everything is fine. request file was deleted correct in step 2
                                                            MoneyNetworkAPILib.debug_z_api_operation_end(debug_seq2, 'OK');
                                                        }
                                                        else {
                                                            console.log(pgm + 'issue 1140. something is very wrong. first fileGet returned OK, fileDelete returned No such file or directory and last fileGet returned OK');
                                                            MoneyNetworkAPILib.debug_z_api_operation_end(debug_seq2, res2 == 'ok' ? 'OK' : 'Failed. error = ' + JSON.stringify(res2));
                                                            delete_failed.push(filename);                                                            }
                                                        // continue with next file
                                                        delete_file(transaction_timestamp);
                                                    });
                                                }); // fileDelete callback

                                            }); // fileGet callback