Update space_read.c: Fix memory leak+more

** Fixed many memory leaks in do_space_db_read() 

** SDBs now load by the SDB attribute, rather than generating a new one on the fly. 
  Use sdb(e), then write that to the SDB attribute of a new ship. This prevents new lower dbref objects shifting the SDB#'s around.

** Ignore extra information in BEAM_* and MISSILE_*. Only loads what it needs anyhow.

** IFF will generate a random value if not set, and be quiet about it.