Update geneticmapconvert

[LouisLeNezet]

PR checklist

This PR improve the genetic map convertion and normalisation module.
It now remove duplicated genetic distance and null rates values.

Some map file does contains null rate or repetition of genetic distance.
Most imputation tools crash with this kind of data resulting in unexpected, criptic behavior:

Segmentation fault in GLIMPSE2_PHASE, Error in if (sum(how_many_cols_below_0) > 0) { : value where TRUE/FALSE needed in STITCH for the single line at position 79150745 on chr9:

pos			rate		cm
79150210	0.44672897	80.085271
79150745	0			80.08551
79150746	0.44864865	80.08551

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