providing colorsamples to heatmap in plot proportions legend projected over the heatmap

[shashwatsahay]

dataset: kielcohort
color sample: cell_type

[schmic05]

This is not easy to fix, since it depends on the number of distinct values in the sample characteristic. If there are many distinct values, as e.g. in the KielCohort dataset, this gets ugly. But if we have PDF export, one can edit the file afterwards with any vector-graphics program. So we leave it as it is, since MeDeCom already tries to find the best location for the legend.