Add sand piles

… until a better solution is found.

init.lua

@@ -379,13 +379,13 @@ pedology.register_sucky_group("silt_fine", "fine silt", "fine silt lump",
 pedology.register_sucky_group("silt_medium", "medium silt", "medium silt lump",
 	4, 3, 30, 1.25, {2600, 2800, 3200, 3800, 4200}, 4, sound_silt_medium, { crumbly = 3, sun_dry = 1 })
 pedology.register_sucky_group("silt_coarse", "coarse silt", "coarse silt lump",
-	3, 3, 20, 1.25, {2000, 2200, 2400, 2800}, 4, sound_silt_coarse, { crumbly = 3, sun_dry = 1 })
-pedology.register_sucky_group("sand_fine", "fine sand", nil,
-	2, -1, 10, 1.111111, {1100, 1200, 1300}, 0, sound_sand_fine, { crumbly = 3, sand = 1, sun_dry = 1 })
-pedology.register_sucky_group("sand_medium", "medium sand", nil,
-	1, -1, 5, 1.111111, {990, 1100}, 0, sound_sand_medium, { crumbly = 3, sand = 1, sun_dry = 1 })
-pedology.register_sucky_group("sand_coarse", "coarse sand", nil,
-	0, -1, nil, nil, {900}, 0, sound_sand_coarse, { crumbly = 3, sand = 1, sun_dry = 1 })
+	3, 3, 20, 1.25, {2000, 2200, 2400, 2800}, 2, sound_silt_coarse, { crumbly = 3, sun_dry = 1 })
+pedology.register_sucky_group("sand_fine", "fine sand", "fine sand pile",
+	2, 0, 10, 1.111111, {1100, 1200, 1300}, 2, sound_sand_fine, { crumbly = 3, sand = 1, sun_dry = 1 })
+pedology.register_sucky_group("sand_medium", "medium sand", "medium sand pile",
+	1, 0, 5, 1.111111, {990, 1100}, 2, sound_sand_medium, { crumbly = 3, sand = 1, sun_dry = 1 })
+pedology.register_sucky_group("sand_coarse", "coarse sand", "coarse sand pile",
+	0, 0, nil, nil, {900}, 1, sound_sand_coarse, { crumbly = 3, sand = 1, sun_dry = 1 })
 pedology.register_sucky_group("gravel_fine", "fine gravel", "pebble",
 	1, 0, 2, 1, {670, 770}, 9, sound_gravel_fine, { crumbly = 2, sun_dry = 1 })
 pedology.register_sucky_group("gravel_medium", "medium gravel", "medium stone",