core: fix calls to `domish.Element.elements`: domish.Element.elements should be called with namespace and element name as 2 arguments, but it has been confused in several places with the call to `domish.Element.addElement` which is often done with a `(namespace, name)` tuple. Unfortunately calling with a tuple is accepted and doesn't raise any error in `elements`, but this result in a wrong element returned. This patch fixes the erroneous calls.

[[Catégorie:Salut à Toi]]
[[Catégorie:documentation développeur]]

= Overview =
This is an autogenerated doc for SàT bridge's API
= Signals =
##SIGNALS_PART##
= Methods =
##METHODS_PART##
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