Implemented the TBB functions for copy, copy_n, fill, fill_n , generate, generate_n, min_element, max_element, inner_product, stable_sort, stable_sort_by_key and sort_by_key

 Added Partial Checked_Iterator support for Inner_Product

 Enclosed Large Buffer test cases within preprocessor statements

 Added a few more test cases for offset & for different data types to verify the correctness of the newly implemented TBB functions.
Added btbb files for copying them to the package.