Register blob ores in mgv6 to replace addDirtGravelBlobs
Combine ores and blobs functions

- Adds material for crafting (keeps def.recipe compatibility)
- Fix two typos in api documentation

Create register ores function. Select and order functions per mapgen
Use blob ore for clay. Update ore height_min/max to y_min/max
Tune flower amount

can be registered by other mods

1. don't delete protected nodes, 2. time out in loaded chunks, 3. don't crash when dying in certain nodes (like default doors or sign_lib signs)

Screenshots at: https://github.com/minetest/minetest_game/issues/411

I think that was just a typo?