warn against running untested scripts

but allow after the first try

library/lua/dfhack.lua

@@ -695,7 +695,14 @@ local valid_script_flags = {
     scripts = {required = false},
 }
 
+local warned_scripts = {}
 function dfhack.run_script(name,...)
+    if not warned_scripts[name] and require('helpdb').get_entry_tags(name).untested then
+        warned_scripts[name] = true
+        dfhack.printerr(('UNTESTED WARNING: the "%s" script has not been validated to work well with this version of DF.'):format(name))
+        dfhack.printerr('It may not work as expected, or it may corrupt your game.')
+        qerror('Please run the command again to ignore this warning and proceed.')
+    end
     return dfhack.run_script_with_env(nil, name, nil, ...)
 end