Apply #3219676 from Shane Liesegang which adds: - support for %factory - a __tostring method - a __disown method

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@12978 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/test-suite/lua/disown_runme.lua

@@ -12,3 +12,9 @@ for x=0,100 do
     b:acquire(a)
 end
 collectgarbage() -- this will double delete unless the memory is managed properly
+
+a=disown.A()
+a:__disown()
+b:remove(a)
+a=nil
+collectgarbage() -- this will double delete unless the manual disown call worked