combine the circle's x_list and y_list to edge. and many misc doc fix
tree7e2c2daa6b9bcbf7ad5ef5d3ac6755cb84ccf9c5
-rw-r--r-- 26 .gitignore
-rw-r--r-- 35147 COPYING
-rw-r--r-- 304 README
-rw-r--r-- 30687 gpl-3.0-zh.txt
-rw-r--r-- 35147 gpl-3.0.txt
drwxr-xr-x - src
drwxr-xr-x - test