Update edgeR_heatmap_MDS.r for eventual transition to R 3.4.4
Update edgeR_heatmap_MDS.r for eventual transition to R 3.4.4

After transition to R 3.4.4, behavior of data.table::fread() function changed.
The selection of "Geneid" and count columns with "colClasses" argument does not work anymore which result in duplicated columns during merge.

Deffering columns selection with a lapply and '[' operator fixes this issue.
Note that conversion to regular data.frame object is required because of '[' operator behavior on data.table objects.

All the best,

Romain.
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