All BGAnimations are "generic", except for those loaded directly from

Background.  This should be more consistent (we were creating BGAnimations
as non-generic in some places where it probably should have been generic).
This means all themes need to explicitly set the position of all BGAnimation
graphics, which is good practice anyway.

stepmania/src/BGAnimation.h

@@ -12,7 +12,7 @@ struct XNode;
 class BGAnimation : public ActorScroller
 {
 public:
-	BGAnimation( bool Generic=false );
+	BGAnimation( bool Generic=true );
 	virtual ~BGAnimation();
 
 	void Unload();

stepmania/src/BGAnimationLayer.cpp

@@ -74,7 +74,6 @@ void BGAnimationLayer::LoadFromAniLayerFile( const CString& sPath )
 {
 	/* Generic BGAs are new.  Animation directories with no INI are old and obsolete. 
 	 * Don't combine them. */
-	ASSERT( !m_bGeneric );
 	Init();
 	CString lcPath = sPath;
 	lcPath.MakeLower();
@@ -472,11 +471,6 @@ void BGAnimationLayer::LoadFromNode( const CString& sAniDir_, const XNode& layer
 	layer.GetAttrValue( "TileVelocityY", m_fTileVelocityY );
 
 
-	bool NeedTextureStretch = false;
-	if( m_fTexCoordVelocityX != 0 ||
-		m_fTexCoordVelocityY != 0 )
-		NeedTextureStretch = true;
-
 	switch( m_Type )
 	{
 	case TYPE_SPRITE:
@@ -504,7 +498,6 @@ void BGAnimationLayer::LoadFromNode( const CString& sAniDir_, const XNode& layer
 			CollapsePath( sPath );
 
 
-			ASSERT( !m_bGeneric );
 			for( int i=0; i<iNumParticles; i++ )
 			{
 				Actor* pActor = MakeActor( sPath );
@@ -533,7 +526,6 @@ void BGAnimationLayer::LoadFromNode( const CString& sAniDir_, const XNode& layer
 			CString sPath = sAniDir+sFile;
 			CollapsePath( sPath );
 
-			ASSERT( !m_bGeneric );
 			Sprite s;
 			RageTextureID ID(sPath);
 			ID.bStretch = true;

stepmania/src/Background.cpp

@@ -158,7 +158,7 @@ Actor *Background::CreateSongBGA( CString sBGName ) const
 	GetDirListing( m_pSong->GetSongDir()+sBGName, asFiles, true, true );
 	if( !asFiles.empty() )
 	{
-		pTempBGA = new BGAnimation;
+		pTempBGA = new BGAnimation( false );
 		pTempBGA->LoadFromAniDir( asFiles[0] );
 		return pTempBGA;
 	}