use proper log command and log level

Merge branch 'FrostRanger-master-patch-01795' into 'master'

Fixed cedars spawning deep underground

See merge request VanessaE/moretrees!11

add minimum minetest version key for contentdb

Merge branch 'fences' into 'master'

add optional fences and gates

See merge request VanessaE/moretrees!2

override default sapling/tree/leaves/wood/etc

get rid of "apple" from descriptions

use table.copy instead of clone-node

Use a "set" for surface list rather than a plain table

(requires biome_lib from commit a96f015c or later)

fix derps in tables

license fixups: use LGPL 3.0 for code, CC-by-SA 4.0 for media