Issue a livelog/#chronicle message if saving-grace saves the hero.
Right now it's classified as conduct for livelog filtering, because
I didn't want to implement a new category (needs update of global.h
and also the template 'sysconf') and conduct felt like the best fit
of the existing classifications.
Report whether saving-grace is available or already used, among
the attributes of magical enlightenment or end-of-game disclosure.
And move the fixes entry for it from the fixes section to the new
features section of fixes3-7-0.txt.
It seems likely that someone will want to turn not using saving-
grace into a tracked conduct. That seems like overkill to me, not
to mention inflating the N for "N conduct games".
b9ff8068b4