genmidi: Fix waveform warnings for some instruments.

This tweaks some of the problem instruments to use only OPL2
waveforms, silencing the warnings and improving playback.
dmxgus: Add first attempt at GUS config.

This is a functioning (but awful) configuration file for the
Gravis Ultrasound card, which is usually stored in the IWAD as
DMXGUS / DMXGUSC. I constructed this by hand, and at least it's
better than nothing. Also included is a sanity check script that
checks the configuration will fit in the memory limits of the card.
sprites: fix TROO* alignment when flipped (Sodaholic)

Sodaholic writes:
>Due to the nature of the engine's sprite flipping, the Imp was often
>misaligned in many rotations, only way to fix it being to add
>horizontal "padding" to the image. So, that's just what I did. With
>this patch, the Imp will be correctly aligned when being viewed from
>angles 6-8.

DW: http://www.doomworld.com/vb/post/1052790
Signed-off-by: RjY <rjy@users.sourceforge.net>
levels: new E1M5 from Z0k

DW: http://www.doomworld.com/vb/post/1053677
Signed-off-by: RjY <rjy@users.sourceforge.net>
levels: e1m1: fix texture alignment on exit switch

Swap the offsets of the two segs on the front side of line 2544, the
exit switch. Seg 235 (from 0 to 48) had offset 48, and 236 (48 to 64)
had offset 0. Clearly these are the wrong way round.

Only noticable in engines that do not use the GL nodes in this map,
and have not yet switched to recalculating seg offsets themselves,
after that spate of wads with bad seg offsets circa late 2005.
sprites: resized revenant from Wesley Johnson

DW: http://www.doomworld.com/vb/post/1058559
Signed-off-by: RjY <rjy@users.sourceforge.net>
sprites: tidy up unused revenant sprites and symlinks
levels: map09 revision 10 (Jan 4, 2012)

DW: http://www.doomworld.com/vb/post/1062252
Signed-off-by: RjY <rjy@users.sourceforge.net>
levels: map13 revision 2.5 (Mar 18, 2012)

DW: http://www.doomworld.com/vb/post/1062252
Signed-off-by: RjY <rjy@users.sourceforge.net>
sprites: new Keen cat replacement from Sodaholic

Sodaholic writes:
>Dunno if this is going to be considered to be in poor taste, but here's
>a Commander Keen replacement I threw together today. (for the record, I
>love cats, and this is just a joke)

>fraggle said:
>>This is all your own work, right? You drew the cat and the rope
>>yourself?
>Absolutely, every single pixel of the animation was done from scratch
>in about an hour.

>fraggle said:
>>This is a completely original character, right? It's not a depiction
>>of a cat from a cartoon, video game, webcomic, or anything like that?
>Completely original, it's just a generic cat, not any specific one.

DW: http://www.doomworld.com/vb/post/1061751 ,
    http://www.doomworld.com/vb/post/1062431
Acked-by: Simon Howard <fraggle@gmail.com>
Signed-off-by: RjY <rjy@users.sourceforge.net>
sounds: those accompanying Keen replacement, from Sodaholic

DW: http://www.doomworld.com/vb/post/1061751
Signed-off-by: RjY <rjy@users.sourceforge.net>
sprites: imp/caco fireballs from Sodaholic

DW: http://www.doomworld.com/vb/post/1062444 (version 3)
Signed-off-by: RjY <rjy@users.sourceforge.net>
graphics: STBAR: updated ammo counter labels from Sodaholic

DW: http://www.doomworld.com/vb/post/1061645
Signed-off-by: RjY <rjy@users.sourceforge.net>
flats: FLAT10: remove spurious red pixels (Sodaholic)

DW: http://www.doomworld.com/vb/post/1061388
Signed-off-by: RjY <rjy@users.sourceforge.net>
sounds: speed up blazing door sounds (Sodaholic)

DW: http://www.doomworld.com/vb/post/1061388
Signed-off-by: RjY <rjy@users.sourceforge.net>
sounds: new imp claw sound from Sodaholic

DW: http://www.doomworld.com/vb/post/1061388
Signed-off-by: RjY <rjy@users.sourceforge.net>
sounds: new demon sounds from Sodaholic

DW: http://www.doomworld.com/vb/post/1061388 ,
    http://www.doomworld.com/vb/post/1061645
Signed-off-by: RjY <rjy@users.sourceforge.net>
sounds: new chainsaw sounds from Sodaholic

DW: http://www.doomworld.com/vb/post/1061388
Signed-off-by: RjY <rjy@users.sourceforge.net>
sprites: new pain elemental from Wesley Johnson

:Name: Pain Elemental design
:author: Wesley Johnson
:date: 4/11/2012
:version: ver 5
::END
email: john <obfuscate> son 2412 <@> usgo <dot> net

Pain Elemental complete Sprite set.
  Custom designed for FreeDoom, for compatibility with existing FreeDoom sprites.
  With wadinfo.txt

- Description:
  Pain Elemental consisting of green metal mesh, with seven flaming
  heads inside.
  The largest head (red) exits to becoming attacking head.
  Dies with green burning mesh.

DW: http://www.doomworld.com/vb/post/1067901
Signed-off-by: RjY <rjy@users.sourceforge.net>
levels: map13 revision 2.6 (May 11, 2012)

DW: http://www.doomworld.com/vb/post/1073705
Signed-off-by: RjY <rjy@users.sourceforge.net>