* Remove remaining hard del()'s in our code.
* Replace deleted() and gcDestroyed with QDELETED macro.
* Fix some strange calls directly to Del() (capital D)
* Make Destroy() return qdel hints.
* Make a few of the Destroy()'s more comprehensive in cleaning up references.
* In edited Destroy() procs, converted to use qdel_null and qdel_null_list macros when possible for pretty code.
* Removed unused variable `sleevecard`
* Railings are an ON_BORDER object that looks like a railing; you can throw and reach across it, but it stops you from falling into holes or whatever.
* Mobs can climb over them (or throw other mobs over them!)
* They are construtable/deconstructable.
* Smoothly auto-joining sprites to look like a railing.
* Changes from Eris: Converted << to to_chat(), Desnowflaked some code, Fixed being able to climb over when windows are in the way.
