1. added new regular expression format for volume
2. added new strip method for msc
3. deleted blank-space author
4. optimized middle name strip method
5. added new matching pattern for no table author list
6. added exception storing for AUTHOR SEARCHING ERROR
Bug fix:
1. error record saving
1. unworkable retrying function back online baby
New Function:
1. reformatted datetime_transform funtion to handle more month typos
2. reformatted process_article function into 3 functions to use multi-threads better running time
3. renewed article url search technique to handle different volume websites
4. more exception handling
5. bettered keywords and affiliation strip method
6. added methods for processing author data when there exists no author table
7. added code for retry failed processing paper
8. more detailed error messages storage