prediction_append: To attach and compare new method to existing comparison study...
In PredictTestbench: Test Bench for Comparison of Data Prediction Models

To attach and compare new method to existing comparison study done with function 'impute_errors()'

1 2	prediction_append(existing_method, dataIn, nextVal, errorParameter, MethodPath, MethodName)

`existing_method`	as Error observations for different methods
`dataIn`	as imput time series for testing
`nextVal`	as an integer to decide number of values to predict
`errorParameter`	as type of error calculation (RMSE, MAE or MAPE)
`MethodPath`	as location of function for proposed imputation method
`MethodName`	as name for function for proposed imputation method