Test grand square N steps, promenade half way.

sdr> sides face grand square
|      3Gv  3Bv
| 
| 4B>            2G<
| 
| 4G>            2B<
| 
|      1B^  1G^
sdr> heads face grand square 6 steps
|      4B>  2G<
| 
| 3G>            3B<
| 
| 1B>            1G<
| 
|      4G>  2B<
sdr> /setFormation(Formation.SQUARED_SET)
|      3Gv  3Bv
| 
| 4B>            2G<
| 
| 4G>            2B<
| 
|      1B^  1G^
sdr> heads promenade half way while the sides square thru
| 1Gv  1Bv
| 
| 4B^  2G^
| 
| 4Gv  2Bv
| 
| 3B^  3G^
sdr> boys run
| 1B^  1Gv
| 
| 2G^  4Bv
| 
| 2B^  4Gv
| 
| 3G^  3Bv
sdr> /// "initially twice, shazam"
sdr> trade
| 1G^  1Bv
| 
| 4B^  2Gv
| 
| 4G^  2Bv
| 
| 3B^  3Gv
sdr> u turn back
| 1Gv  1B^
| 
| 4Bv  2G^
| 
| 4Gv  2B^
| 
| 3Bv  3G^
sdr> single file promenade home
|      3Gv  3Bv
| 
| 2B>            4G<
| 
| 2G>            4B<
| 
|      1B^  1G^
sdr> /exit