I don't like the song-dependent courses in the trunk. It causes "song

not found" warnings for most people.  The core shouldn't "depend"
on particular songs.  Distribute courses with songs, or separately, but
let's not depend on them here.

stepmania/Courses/Samples/StepMix Oni AwardX Sample.crs

@@ -1,8 +0,0 @@
-#COURSE:StepMix Challenge;
-#LIVES:4;
-#METER:Regular:10;
-#SONG:StepMix 1.0/August:MEDIUM:AWARD3;
-#SONG:StepMix 1.0/Rebirth:HARD:AWARD2;
-#SONG:StepMix 1.0/32a5:HARD:AWARD1;
-#SONG:StepMix 1.0/Oceans of Time:HARD:AWARD0;
-#SONG:StepMix 1.0/Frozen Fire (2):HARD:;

stepmania/Courses/Samples/StepMix Survival Sample.crs

@@ -9,7 +9,7 @@ TIME=37.722:END=56.586:MODS=*.2 20% Expand:
 TIME=56.586:END=75.443:MODS=*.2 40% Expand:
 TIME=75.443:END=91.3:MODS=*.2 80% Expand:
 TIME=91.3:END=120.5:MODS=*3.3 3.3x,*3.3 Hidden,50% HiddenOffset,*3.3 50% Sudden,*3.3 -60% Expand;
-#SONG:StepMix 1.0/Blow Me Up:HARD:;
+#SONG:*;
 #GAINSECONDS:50;
 #MODS:
 TIME=0:END=118.5:MODS=2x:
@@ -22,7 +22,7 @@ TIME=81.968:END=93.465:MODS=*5 20% Flip,*5 -200% Tiny,*5 1x:
 TIME=93.465:END=96:MODS=*5 no Flip,*5 no Tiny,*5 2x:
 TIME=93.465:END=104.962:MODS=*5 120% Wave:
 TIME=104.962:END=118.5:MODS=*0.15 Distant, *0.15 200% Tiny,*5 no Wave;
-#SONG:StepMix 1.0/Destiny -Eclipse Mix-:HARD:;
+#SONG:*;
 #GAINSECONDS:50;
 #MODS:
 TIME=0.420:END=103.576:MODS=2x:
@@ -42,7 +42,7 @@ TIME=80.140:END=86.045:MODS=*5 160% Beat:
 TIME=86.045:END=91.950:MODS=*5 180% Beat:
 TIME=91.950:END=97.855:MODS=*5 200% Beat:
 TIME=97.855:END=103.576:MODS=*.25 no Beat:;
-#SONG:StepMix 1.0/Let it Flow:HARD:;
+#SONG:*;
 #GAINSECONDS:70;
 #MODS:
 TIME=0:END=109.399:MODS=2.25x:
@@ -53,7 +53,7 @@ TIME=58.862:END=71.262:MODS=noholds,nojumps:
 TIME=71.262:END=82.464:MODS=*1.25 Flip:
 TIME=82.464:END=109.399:MODS=25% Flip,25% Invert:
 TIME=96.599:LEN=12.8:MODS=nojumps;
-#SONG:StepMix 1.0/Mana:HARD:;
+#SONG:*;
 #GAINSECONDS:70;
 #MODS:
 TIME=0:END=118.366:MODS=2.5x,Blind:
@@ -63,4 +63,4 @@ TIME=49.066:END=76.108:MODS=*5 no Split,*5 Alternate,*5 Reverse:
 TIME=76.108:END=89.629:MODS=*5 no Alternate,*5 Split,*5 Reverse:
 TIME=89.629:LEN=1:MODS=*5 no Split,*5 no Reverse:
 TIME=103.152:END=118.366:MODS=*.125 125% Centered,*.125 1x,*.075 Stealth,*.075 Dark:;
-#SONG:StepMix 1.0/Oceans of Time:EXPERT:;
+#SONG:*;

stepmania/Courses/Samples/Tournamix 4 Sample.crs

@@ -1,8 +0,0 @@
-#COURSE:ワーーーーイ!;
-#SONG:Help me Dr. Dick:MEDIUM:1.5x,SKIPPY;
-#SONG:DOO-BE-DI-BOY (KCP MIX):MEDIUM:1.5x,BIG;
-#SONG:Laugh and Beats:MEDIUM:1.5x,WIDE;
-#MODS:
-  TIME=16.20:LEN=10000.000000:MODS=*500 beat;
-#SONG:Baby Got Back:HARD:;
-