Add "cscope" target.
-rw-r--r-- 1390 AUTHORS
-rw-r--r-- 2917 EXPERIENCE
-rw-r--r-- 4621 LICENSE
-rw-r--r-- 244 Makefile
-rw-r--r-- 15218 TODO
drwxr-xr-x - doc
drwxr-xr-x - solutions
drwxr-xr-x - specs
drwxr-xr-x - src
drwxr-xr-x - ta-advice
drwxr-xr-x - tests