"Regenerating" old Maps

[octacian]

I have a world that was generated using Minetest v0.4.12. However, in v0.4.13 I notice some really neat biomes have been added from savannah to glaciers. Is there a way for me to "regenerate" my world or parts of it so that these new things can be found without losing all my builds and such? I have also added an ore with my own mod, so that would be a problem too as it is important to have available. Another thing is that I am planning on installing the sea life mod, which would need things to be generated too.

If needed I can just start fresh in another world after exporting my builds to worldedit schematics, but I'd rather make use of the one I have already been running for months. I also would assume that I can just go far enough away from my current location to a place where the world hasn't fully generated, but that is pretty inconvenient.

Thanks.

[paramat]

You can regenerate world to it's fresh state.but it would delete any builds or changes you have made.
Newly generated world will of course have the new biomes.

[Fixerol]

Be sure to make backup before any experiments!
You can do /deleteblocks "somearea" to delete blocks, they will regenerate iirc, if you can avoid damaging your builds.
OR
maybe this can help: https://github.com/AndrejIT/map_unexplore
IIRC this script removes any blocks except player placed, and after you do it, just use it again and should generate blocks.