Lower required free (non-buffer/cache) memory for Tails Upgrader.
At least in Jessie, this value is generally around 75 MiB in the automated test suite, preventing the upgrade check from happening. It's been lowered to an arbitrarily chosen 32 MiB, but I wonder if we can remove that check completely. After all, the available memory + buffers + cache should be what actually matters.
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