Recommend FeEn (agentgt).

Because of their stabbing upgrade. For En, Fe replaces Ha, which had a
reduction to its Stealth apt; for Fe, En replaces FE, which lacks the
defensive aspects other recommended starts have and which are quite useful
given their squishiness.
Improve expiration message when rMsl effect is still up (wheals)

For example, if you cast rMsl then put on "Air, you would get a "less
protected" message when the spell ablates, even though you still had
perma-rMsl from the amulet.  Now the message in this case is "You feel
your spell is no longer protecting you from missiles."  Losing DMsl
on top of perma-RMsl gives the same "less protected" message as before.
Small documentation corrections.
Initialise bolt::can_see_invis and nightvision.

Valgrind found that they were used uninitialised: we set them to true in some
cases, but never actually to false.

These are initialised on fire so there shouldn't be a need to copy them
in bolt_parent_init.
Fix a Ru typo (fearitself)
Replace a very expensive Object.keys() call with a simple counter
Add Austin Appleby to CREDITS.txt
Change hydra form duration

Extend it to the same duration as blade hands, and make heads
reset when the spell is recast (to extend duration).

The ultra-short duration was a little vestigial after the high
hunger cost went away; better to save it for whenever that idea
comes back.