pull request #1114 - NetHack.ad remarks about XPM

Pull request from bernhardreiter:  NetHack.ad has a comment about
needing to use an external tool such as XV or PBMplus rather than
the NetHack.double_tile_size resource if nethack is built with the
USE_XPM configuration.  Add some more detail since using 'hints' when
setting up the Makefiles can define that behind the builder's back.

The extra detail won't be useful to players who obtain prebuilt
binaries that incorporate the X11 interface.  The comment in config.h
(see preceding pull request) won't be either, and maybe should be
moved to NetHack.ad where such users will be able to see it.

Fixes #1114.

doc/fixes3-7-0.txt

@@ -1722,6 +1722,11 @@ experimental #saveoptions wasn't saving the set of cond_xyz options correctly;
 	if player viewed the 'm O' submenu for status conditions, they would
 	get saved even if not changed; otherwise, ones that came in from the
 	old RC file wouldn't be included in the new one
+knockback or recoil while levitating could hurtle the hero through a wall of
+	water to the spot beyond unless it happened on the Plane of Water
+if recoil from throwing an item while levitating sent hero into a wall of
+	water, the thrown item got placed in that water rather than at its
+	intended destination
 
 
 Fixes to 3.7.0-x Platform and/or Interface Problems Exposed Via git Repository