check_sections.php		find wrongly segmented sections
check_sections_details.php	re-segment a section, should be mainly accessed from check_sections.php
				if to be accessed directly, book id and overlapping threshold (i.e. count) should be given in the url
				e.g. check_sections_details.php?book_id=12345&count=5
edit_section_db.php		included by check_sections.php and check_sections_details.php

insert_new_columns_into_books/	contains programs parsing book information from other resources and the results