Pass sample identifier to minimap in read group metadata

[ssadedin]

Currently minimap is executed in a way that does not add read group metadata in the output BAM file. The result is that the resulting BAM file doesn't identify which sample it is for.

I would assume this is done the same way as for BWA, so it could be copied from there, ie: adding the flag

   -R "@RG\\tID:${sample}_${lane}\\tPL:$PLATFORM\\tPU:1\\tLB:${library}\\tSM:${sample}"