* 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`
* This device converts CO2 to O2 using power and "algae". The extra carbon is a byproduct in the form of "graphite"
* This is intended for virgo3b, which has no oxygen in its atmosphere but enough CO2 for us to just extract it.
