Add the old instructions

old_not_used_files/lab3-4_old/main.cc

old_not_used_files/lab3-4_old/parser.y

old_not_used_files/lab3-4_old/parser.y.OLD

old_not_used_files/lab3-4_old/scanner.l

old_not_used_files/lab3-4_old/string.cc

old_not_used_files/lab3-4_old/string.hh

old_not_used_files/lab3-4_old/symtab.cc

old_not_used_files/lab3-4_old/symtab.hh

old_not_used_files/lab3-4_old/test/test

old_not_used_files/lab3-4_old/test/test.OLD

traces/trace-lab3.txt