fix github issue #202 - worn items inside engulfer

Fixes #202

When swallowed, you can take things from the engulfer's inventory, if
there are any, via pickup.  Items might be worn by the engulfer and
when "picked up" those weren't being unworn before being added to
hero's inventory.  Then they would be formatted as "(being worn)" and
could trigger warnings or worse.

Conceptually they should be worn on the outside and not be accessible
from the inside, so I've made attempts to pick up worn items fail
rather than fix up the unwearing.

Using ':' when swallowed to look at the engulfer's inventory describes
that inventory as "contents of <mon>'s stomach".  That's weird for any
worn items, but the situation is so rare I haven't made any attempt to
deal with it.

doc/fixes36.3

@@ -1,4 +1,4 @@
-$NHDT-Branch: NetHack-3.6 $:$NHDT-Revision: 1.83 $ $NHDT-Date: 1562114348 2019/07/03 00:39:08 $
+$NHDT-Branch: NetHack-3.6 $:$NHDT-Revision: 1.84 $ $NHDT-Date: 1562203850 2019/07/04 01:30:50 $
 
 This fixes36.3 file is here to capture information about updates in the 3.6.x
 lineage following the release of 3.6.2 in May 2019. Please note, however,
@@ -94,6 +94,10 @@ saving bones with 'perm_invent' On could result in "Bad fruit #N" warnings
 update persistent inventory window immediately if 'sortpack' option is toggled
 grammar bit for wizard mode final disclosure; attribute section could show
 	"You had N experience points, 1 more were needed to attain level X+1."
+if an engulfer has any worn items, hero could pick them up from inside and
+	they wouldn't be unworn properly, eventually triggering warnings or
+	worse (Juiblex will wear an amulet if created with one; a shapechanger
+	might wear one and then turn into an engulfer)
 
 
 Fixes to Post-3.6.2 Problems that Were Exposed Via git Repository