Save should do something about process

[faassen]

When process and save both are both configured, save could wipe out any process requests still buffered - save will do a reprocess of everything anyway.

But that's actually maybe not correct: what if there are updates (field cleared, default set) still to be processed when a save is done? Defaults should be ignored, but field clears should be triggered or alternatively result in a special validation message. But that means that validate_all should check for this, so this means again that we can throw away anything in process when we save.