Common agreements from the meeting for PR#50 before next release (Xiaoli, Tina, Martin)

[xiaoliz0]

1. Rename the functions related to Excel from "read_exl" to "read_tsv", better understanding for currently data file type.
2. Delete the variables are not in use in the scripts.
3. Optimize codes related to "data_issue" in TSOPPI output files.
4. All clinical information column assignments can be grouped in a dictionary, and then be accessed via columns['age'].
5. Format strings in the script.
6. Rename variable from "table_header_aliase" to "table_header_aliases".
7. Rename "header_not_exist_InTable" to "header_not_exist_in_table".
8. Function of adding table into the slide 8 in ppt report will cause errors for the previous old data due to missing 2 new added columns.
9. Remove column Protein_change_(code) which is not in use currently from the script.
10. Rename column "Genomic coordinates in hg19 build" in table to "Genomic_coordinates_in_hg19_build"? (confirm with biologist group)
11. Extract all hard coding information from script to configure file. (To do later)
12. Config file to be yaml format config file should be yaml format #52 (To do later)