Changed new_seg to return a pointer to a seg_t.  Added function prototypes for print_seg and new_seg to seg.h.
Began implementing my_malloc for first-fit.  Need to complete logic for reducing size of hole in shrink_hole_size_bytes().  Need to implement logic for carving new allocated segment from hole in new_seg_from_hole().  Need to implement logic for adding newly allocated segment to alloc_list in allocate_from_hole()  Logic for finding first-fit hole completed in find_first_fit().