basically popup notifications allow when not online/chat works. so popup notifications I think are 100% ready :P. some other fixes too

cell_renderer_image is gtk specific so it's not in common

adding setting in advanced/misc for not checking for new version. [this is not an expert setting, and should stay in prefs window]. ALSO fixes/typos all over

when windows already exist present() them. cancel button and not close in account_modification_window