Re-arranged the usage message and command-line options.
tree7c0fac7e92f2d36901e5b069685a5a487f85223f
-rw-r--r-- 62 .gitignore
-rw-r--r-- 1113 LICENSE
-rw-r--r-- 442 Makefile
-rw-r--r-- 4696 README
-rw-r--r-- 5261 common.mk
drwxr-xr-x - doc
drwxr-xr-x - etc
drwxr-xr-x - pkg
drwxr-xr-x - src