Made add_frame_fifo() into a more robust add_frame() function that adds frames to the end of both linear and circular linked lists, depending on the global policy value.  Verified to work for Test 1.
Merge branch 'master' of github.com:skotchandsoda/cmpsc473-p3
Fixed build for tests 5 and 6 in Makefile.
Implemented clock_evict().