Do not "help" the user by changing parameters

On 30+ places we have code like this:

```php
if (!in_array($state, array('open', 'closed'))) {
$state = 'open';
}
```

If the user misspelled the `$state` we should not help them. That may cause unpredicted actions. We should throw an exception or let the API call fail.

This is a BC break. I've marked it in milestone 3.0.

Search the PHP source for the repeated in_array parameter-normalization pattern and review how invalid API parameters currently fail. Determine the consistent failure behavior and identify all affected locations; done means misspelled parameters are no longer silently changed and the existing test suite passes.

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