Checksum bug

[coli...@gmail.com]

I found an issue with the checksum routine. 

It was seen when sending group specific query with a high group number. e.g. 239.254.85.22.

It appears the checksum routine was folding the sum on every addition. The correct behavior is to fold after finishing the sum.

Here is a patch that fixes it.

[Sebastian Woelke]

Thank you very much, I will look into it and update the proxy.