[ewiki] Bug in Binary Upload/DB Layer

I think we've got a bug in the signatures of our database layer
functions, ewiki_database() and ewiki_database_mysql() both accept args
by value.  while nomally I would be in favor of that,  this results in
trippling the memory requirement.  


I don't think it's related, but for large pages (above 750K) something
near here is causing an apache crash on my test server even with all the
relevant variables maxed out.  (memory allowed, file upload size, post
variable size, and EWIKI_UPLOAD_MAXSIZE all set to 40MB).  Any ideas
welcome.

Andy


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