Manualy match genes in Genes widget

[robertcv]

Genes often don't get automatically matches to Entrez ID in the Genes widget. I would want a manual way to match them. I envision something similar to what Geocoding widget does. The mapping should then also be stored in the context so you don't have to redo them every time. I understand that sometimes there are a lot of mismatches so I would suggest this to be an option up to a certain number of mismatches.