Add burial.lua by Putnam

It's useful, and why not?

NEWS

@@ -9,6 +9,7 @@ DFHack Future
     New scripts
         view-item-info: adds information and customisable descriptions to item viewscreens
         fix-ster:  changes fertility/sterility of animals or dwarves
+        burial:  sets all unowned coffins to allow burial ("-pets" to allow pets too)
     New tweaks
     New features
         dwarfmonitor date format can be modified (see Readme)

Readme.rst

@@ -2247,6 +2247,11 @@ If the name of the patch has no extension or directory separators, the
 script uses ``hack/patches/<df-version>/<name>.dif``, thus auto-selecting
 the version appropriate for the currently loaded executable.
 
+burial
+======
+Sets all unowned coffins to allow burial.  ``burial -pets`` also allows burial
+of pets.
+
 create-items
 ============
 Spawn arbitrary items under the cursor.

scripts/burial.lua

@@ -0,0 +1,19 @@
+-- allows burial in unowned coffins
+-- by Putnam https://gist.github.com/Putnam3145/e7031588f4d9b24b9dda
+
+local utils=require('utils')
+
+validArgs = validArgs or utils.invert({
+ 'pets'
+})
+
+local args = utils.processArgs({...}, validArgs)
+
+for k,v in ipairs(df.global.world.buildings.other.COFFIN) do
+    if v.owner_id==-1 then
+        v.burial_mode.allow_burial=true
+        if not args.pets then
+            v.burial_mode.no_pets=true
+        end
+    end
+end