Eggs are not vitamins.
Hard boiled eggs!

Adds hard boiled egg comestible and recipe, as suggested on the forums.
Overhaul morale calculations for making a zlave.
Make messages for interacting with zlave more visceral and clear.
Reverse double-counting of remaining moves, thanks BevapDin.
Make zlave creation not suspendable, you'll have to start over if interrupted.
Survival skill increases tolerance for morale loss from making zlaves, but doesn't prevent it.
Simplify zlave making difficulty and comment its rationale.
Allow making a zlave at lower skill levels, the balance is the chance of failure.
Replace mentions of zlave with zombie slave.
Merge branch 'zlave-tweaks' of https://github.com/kevingranade/Cataclysm-DDA into slaver
Merge pull request #8389 from Rivet-the-Zombie/boiled-egg

Hard boiled eggs!
Merge branch 'master' of https://github.com/CleverRaven/Cataclysm-DDA
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Merge branch 'master' of https://github.com/CleverRaven/Cataclysm-DDA