signature (set_editor_text): try to use HTML signature (e_msg_composer_new_with_sig_file): added send_html arg to be able to use HTML signature svn path=/trunk/; revision=6510
signature (set_editor_text): try to use HTML signature (e_msg_composer_new_with_sig_file): added send_html arg to be able to use HTML signature svn path=/trunk/; revision=6510