Add support for value 'save' to attribute 'special' for buttons in
form view. This is useful for form views in dialogs. When clicked,
it saves the form view and closes the dialog (the default 'Save'
button doesn't close the dialog). Without this, the only way to
achieve that was to define a dummy python method and call it with
<button type="object" name="dummy_method"/>.
Simon Lejeune
a0c16e9cd2