delete plot heatmap cluster
in 'heatmap cluster' delete plot heatmap which prints hm to out:
->plot heatmap for each subgroup
--[dendrogram w/ 2 branches and 113 members at h = 3.74]
|--[dendrogram w/ 2 branches and 65 members at h = 1.35]
| |--[dendrogram w/ 2 branches and 47 members at h = 0.726]
| | |--[dendrogram w/ 2 branches and 21 members at h = 0.437]
| | | |--[dendrogram w/ 2 branches and 15 members at h = 0.267]
| | | | |--[dendrogram w/ 2 branches and 2 members at h = 0.133]
| | | | | |--leaf "33528"