Clarify use of thread_get_nice() and thread_set_nice().
treec75e2d01066b3ad7c7cdc7c3beed1fe7640b65c4
-rw-r--r-- 1233 AUTHORS
-rw-r--r-- 4583 LICENSE
-rw-r--r-- 244 Makefile
drwxr-xr-x - doc
drwxr-xr-x - specs
drwxr-xr-x - src
drwxr-xr-x - tests