Figure out how much would change if we compute flag thresholds from bwauths
In #8273 (moved) we're about to switch over the Flag, Guard, etc computations to look at measured bandwidth, not declared bandwidth.
This is probably good for security in some way we haven't fully fleshed out (or at least I haven't).
Long ago, we had plans to do exactly this, at least for the Fast flag, but we stalled them for reasons I don't remember. Mike?
Karsten, it occurred to me that you'd be in a good position to answer the question "how different would the flag assignments actually be, if we switched?"
Somewhere in here we will also want to answer the question of "what replacement values should we use for parameters like AuthDirFastGuarantee, AuthDirGuardBWGuarantee, whatever Nick called the value of 4KB, etc."