Updated files...see notes-------------------------------------------> Today, added D-TREE, D-TREE-PARAMS, D-TREE-PREDICT and D-TREE-PARAMS. Added documentation for each, and 1 main example for the 4 functions, Added structs.lisp file with the D-TREE-NODE struct. Yesterday added functions, ASSGN, K-NEAREST, and K-NEAREST-FIND-NEAREST with examples and documentation. Updated PRINT-MAT function and fixed errors in the examples.lisp file.