NH4: Don't say "you climb up/down the ladder"

Don't say "you climb up/down the ladder"
Alex Smith <ais523@bham.ac.uk>
6f55aca8ead16178092875a0899209ebc836337e
NH4: Make 'x' take no time

ready_weapon() is supposed to take a turn if swapping weapons causes the
character to try to wield an artifact that blasts them, but that doesn't
really matter.

Make x take no time
Alex Smith <ais523@bham.ac.uk>
8c894a3015cba369ad17ec9b597f0a856826110f
NH4: Fix sitting on object in pit (C343-6)

C343-6: "You can #sit on an object at the bottom of a pit that you are
not in."

This checks for the player's trappedness in pit-like traps before
handling sitting effects for objects in said trap.

Fix C343-6
Alex Smith <ais523@bham.ac.uk>
8c6d54980ca290b3310875b38ca3db0a33fcf7f3
NH4: Fix typo in NitroHack README

Fixed a typo in README
Trevor Cook <trevdc@gmail.com>
7ed444ee1c8104dd7cf9c29bac5a7d3696c581c8
Fix "You hear The knife tumbles downwards."

Without this fix, this kind of message appears when dropping an item
over a pit while blind, complete with bad capitalization of "The" and
"tumbles" instead of "tumble".  Found by boxo/Box_ in the #unnethack IRC
channel on FreeNode.

This bug also exists in vanilla NetHack, upstream NitroHack, UnNetHack
and NetHack4.