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/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;
 	}