Cleanup name-password dialog:

Cleanup name-password dialog:

* hildon-widgets/hildon-name-password-dialog.[ch]

        (HildonNamePasswordDialogPrivate): nameEntry and passwordEntry
        types changed from *HildonCaption to *GtkEntry

        (hildon_name_password_dialog_set_property): layout fixes;
        duplicated code replaced with calls to relevant public functions

        (hildon_name_password_dialog_get_property): layout fixes;
        duplicated code replaced with calls to relevant public functions

        (hildon_name_password_dialog_init): fixed leaking group variable;
        reworked to have captions as local variables and captioned entries
        in the private struct

        (hildon_name_password_dialog_new_with_default): name and password
        arguments declared const

        (hildon_name_password_dialog_get_name): type check added + cleanup
        (hildon_name_password_dialog_get_password): likewise.

        (hildon_name_password_dialog_set_domain): domain argument declared
        const; type check added + cleanup