modifies set of books to remove duplicate references

all of module and lab files are included in books 2-5. The
four index files used for books 2-5 are deleted as they are
no longer used.

Change-Id: Iac9aa891081fc2914db055edd7ac054d5fc30ff7
Closes-Bug: #1275171
Merge "modifies set of books to remove duplicate references"