CRM-8435 Pre hook inconstencies affecting RULES

Rules needs more information to act on a delete than exists when POST hook called.

I can move it to the PRE hook (http://pastebin.com/NJtn71yJ) but PRE hooks also need to be edited to pass more information to the hook than currently occurs.

However, the discussion is then that not all pre hooks have the object loaded when delete is called

• In contact and event , relationship, grant it is loaded (either before or shortly after the PRE hook) but not passed in the PRE hook

• for group & participant, contribution, pcp, pledge it isn't loaded

• for tag & membership_payment is is passed to the hook

So, do we try to be consistent & pass it out for all? Pass it out for none? Or do we fix those that have it loaded to pass it out & expect devs to test for it?

Also, note it needs to be an array - what is the syntax for converting to array?