Fixed crashing bug in GasExplosion()

Player or NPC being struck by mine-activated mustard gas no longer
causes a crash.
"Fixed" Silva Earthquake crashing on GC6

Really more of a workaround than an actual fix, but better than a crash.
Wolves will spawn when praying to Silva on GC6 rather than an earthquake
triggering.
Fixed Silva earthquake crashing bug in GC6

Silva can now trigger earthquakes in GC6 without the game crashing.
Revert "Fixed Silva earthquake crashing bug in GC6"

This reverts commit 733686148488de19c1fedf12137d98d09e06c76a.
Fixed Silva Earthquake crashing on GC6

Silva can now trigger earthquakes on GC6 without the game crashing.
Cleaned up Silva fix

Searching through completely uncommented code for helpful functions is
(queue Spongebob rainbow) *fun.*

Messing with the script for the sake of a bugfix bothered me from the
start; this is how I should've done it.
Fixed omission of LastPray counter for V+M

Fixed bug in gods.cpp that caused game to not display the last time the
player prayed to Valpurus and Mortifer, as well as several typos (every
instance of "comfort" was spelled with an 'n'...)
Typo fixes

Fixed typos in command.cpp, human.cpp, and char.dat
Spider Retrieval Side Quest

Bringing a tamed spider to the Child Tourist in New Attnam who asks the
player to bring him a demon spider will grant a reward.
CHA affects Wand of Resurrection Taming

When resurrecting a corpse, the player must have CHA equal to or greater
than half of the creature's TamingDifficulty in order to successfully
tame them.
Added NetHack Keybinding Option

Added option to cycle between Normal, Alternative, and NetHack movement
control schemes.

If necessary in the future, the cycleoption type used for the control
scheme setting can be tweaked for use with other cyclical options.
Expanded Screenshot Function

Rather than the old screenshot function that would overwrite the same
"Scrshot.bmp" file every time you hit the print screen key, screenshots
will now be saved in the Scrshot/ directory as "Scrshot000.bmp",
"Scrshot001.bmp", etc.
Total equipment weight shown in equip screen
Typo fixes

in stack.cpp, char.dat, gods.cpp
Bugfix for off-center loading animation
Added Blob's drawing of Ivan and Vlad to GC8 entry

IVlad.pcx can be replaced if someone creates a better version.
Generalization of cycleoption

Fixed cycleoption to be more generic (thus usable for other config
options), rather than having code for the DirectionKeyMap option within
its functions.
Typo fixes

in gods.cpp, lterras.cpp, char.dat, and item.dat
More typo fixes
Screenshot fix for Linux

Screenshots will be saved to ~/IvanScrshot/ (this directory can be
changed to preference at line 308 of whandler.cpp)

May only work in full screen mode, as some window managers take a
screenshot of the desktop when pressing Print Screen.