The shortcomings of FUH

[tomasbrod]

The boinc FUH is trash. I redone it in my project to write to database instead, because I need that. It would not be good for other boinc projects performance-vise.
The signing of uploads with RSA is superfluous. Simple MAC (or keyed-hash) is enough. Submit that.
In my impl i need to add check whether result is in right state to upload. But it NEVER overwrites already.
Check how the boinc fuh ensures immutability.