Unit_Handling_and_Uncertainty.ipynb: change examples after changing the storage structure of uncertainty information to tuples
data_uncer_004.htf: change the text format for '=' sign and add a column of data without uncertainty information
io.py: change the uncertainty information input algorithm for the new file format and add a function cleanse_uncer to cleanse the uncertainty information based on raw data
uncer_cal.py: new uncertainty information calculation function based on information in tuples but not classes
uncer_class.py: removed because the uncertainty information is not in class structure anymore