Edit reaction ids in map

[sulheim]

It would be very nice if it was possible to change the bigg_ids directly in the map.

The reason for this is that I reuse old maps to draw one for my own GEM, and I find that I just have to change the IDs slightly to get it correct (like removing the last letter(s), e.g. pp or m, to change compartment). Currently I just edit the json file directly and then reload the map, but it is a bit of a hassle.

[zakandrewking]

This seems reasonable. Thanks for the suggestion! I'll keep this open so we can prioritize it.