Fixes papyrus not growing on savanna dirt.
Also updates the nodes papyrus can grow on, which were incorrect for a long time.

This allows mods to easily implement the same behaviour, e.g. for letters.

Avoids player-placed leaves decaying when building while sneaking, which is common.

Add an option, default disabled, to extend the collision boxes upwards.

This prevents a crash when a 'nil' digger is passed by the engine to
minetest.node_dig.

Fence rail: Only connect to 'group:fence'.
Update map mod README crafting recipe documentation.

Dedicated fence rail textures coming in a follow-up PR.

Add compatibility code with deprecation warning.

Original recording by Ryding.
http://freesound.org/people/Ryding/
Found by Anth0rx, edited by paramat.

Add and use 'default.node_sound_snow_defaults()' function.

An excessive load has been reported caused by the node searching, so even
when no lava is present.

This reverts commit e523c3a2 to re-enable
the overriding and redefinition of these global functions.

Action of some abm's call functions directly, instead of calling the function inside a function.

Some code was lost during a rebase of a recently merged commit (73e4666f).

Since meta secret field is blank on any keys (default:key) obtained using
/give, the game will crash if you attempt to use one of these. This follows
along the principle that the game should never have any reason to crash.

Completes a forgotten update in 9d3a5263

Return to previous parameters interval = 1, chance = 2.
Compensates for the increase in default active block radius.
Large amounts of lava cooling at once is known to overload sound
creation, producing error messages.

This implements a node-timer based leafdecay mechanism, and exposes
an API to use it in mods.

The API is documented in game_api.txt.

`default.register_leafdecay(leafdecaydef)`

`leafdecaydef` is a table, with following members:
{
	trunks = { "default:tree"}, -- nodes considered trunks
	leaves = { "default:leaves", "default:apple"}, -- nodes considered leaves
	radius = 3, -- activates leafdecay this far from the trunk
}

The algorithm will drop `leaves` items in the area if no `trunks` are found
in the `trunk_radius` sized area around the position of the leaf. If a node
listed in `leaves` has a group `leafdecay_drop > 0`, then the item is dropped,
otherwise the item is removed but not dropped.

The algorithm also implements a value `default.leafdecay_speed` (default
15) which can be modified to increase or decrease of the leaf decay. The
algorithm will vary the actual speed a bit to introduce randomness.

Leaf decay is randomized by 0.1 seconds to reduce the chance that
decay happens many times on the same second interval. This requires
nodetimer_interval to be set to values lower than 1.0 to have an
effect.

The leaves will decay between 2 and 10 seconds after digging the trunk,
and happen at non-integer second intervals.

-- The API was added by sofar.

* rename to default.can_interact_with_node()
* pass pos instead of meta
* change order of arguments

Now that the missing 'default_dig_snappy' sound has been added we can
remove the dirt dig sound from the table. All nodes that use the
leaves defaults table have group 'snappy' so 'default_dig_snappy' now
becomes their default dig sound.

I recently made glass footstep and dig gains too low, raise slightly.
Change dirt dug gain from above-maximum 1.5 to maximum 1.0.
Reduce gain of footsteps: stone, dirt, gravel, wood, metal
Raise gain of leaves footstep.

Some nodes with the snappy group (wool, glass pane, seeds) were missing
sound when dug with a sword.
Adding the sound causes it to be used for glass pane, so define a 'dig'
sound in the 'node sound glass defaults' table, use the footstep sound.
Adding the sound also causes it to be used for seeds which deliberately
have no dig sound, so add an empty sound override for seed dig.

Reduce the gain of the glass footstep sound which was excessively loud.

Add some freesound members to license.txt.

Plus one silent sound to break repetition 'default_water_footstep.4.ogg'.