Enlarge client user mode buffer, reduce client flags buffer

We have to enlage our user mode buffer, so we can handle even unknown
user modes in the future; and reduce the client flags buffer, because
I can't imagine why we ever would need ~100 flags!?

Now we support up to 15 user modes (was: 8) and up to 15 flags (was: 99).

So in the end, we even save 99-15+8-15=77 bytes for each client structure!

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