app: report config limits instead of crashing

The remote and folder counts and the serialized config size are enforced
only inside save, which throws. Every other rule an editor can break is
reported in the form, so a config that outgrew a limit crashed the
activity instead of saying so. overLimit answers before the entry is
added, and the editors report the answer.

hostKeyAllowed reconstructs the known_hosts address that rsh writes with
knownhosts.Normalize, and nothing recorded or tested that coupling.
Normalize leaves the host bare on port 22 for IPv6 literals too, so
bracketing them here looks right and would reject every IPv6 pin.

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