A couple of things noticed when looking at the death-by-brainlessness
code. The 3.4.3 code ran a loop while life-saving was keeping the hero
alive, which would work if someone added other sources of life-saving than
the amulet but not if they added some form which didn't get used up when
it kicked in. Post-3.4.3, the dev code eliminated the loop but was no
longer guarding against additional forms of life-saving. This attempts to
clear the relevant field once any form of life-saving takes effect (for
brainlessness). It's not perfect since someone could change `Lifesaved'
to look at something other than the hero's properties, but at least it
still avoids the risk of getting stuck in a loop if someone makes a really
bad customization.
Also, make life-saving use min(2*level,10) instead of flat 10 for
amulet or 8*level for explore/wizard survival when it saves someone whose
max HP have been clobbered somehow. Other places assume that 1 HP per
level is the lowest the hero will have; saved-life gives a modest bit more.
Lastly, some post-3.4.3 code to make ghosts/shades immune to brain
sucking was using mon_nam() to start a sentence; Monnam() is needed there.
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