Change default-frame-alist and menu/tool-bar-mode interaction (Bug#2249).

Change default-frame-alist and menu/tool-bar-mode interaction (Bug#2249).
Don't add entries for `menu-bar-lines' and `tool-bar-lines' to
`default-frame-alist' and `initial-frame-alist' at startup.
Instead, use X resources to update the `menu-bar-mode' and
`tool-bar-mode' variables at startup, and use them as defaults during
frame creation.

* lisp/frame.el (frame-notice-user-settings): Don't change
default-frame-alist based on menu-bar-mode and tool-bar-mode, or
vice versa.

* lisp/menu-bar.el (menu-bar-mode):
* lisp/tool-bar.el (tool-bar-mode): Don't change default-frame-alist.
Set init-value to t.

* lisp/startup.el (command-line): Use X resources to set the value of
menu-bar-mode and tool-bar-mode, before calling frame-initialize.

* src/frame.c (Vmenu_bar_mode, Vtool_bar_mode): New vars.

* src/w32fns.c (Fx_create_frame):
* src/nsfns.m (Fx_create_frame): Likewise.

* src/xfns.c (Fx_create_frame): Don't consult X resouces when setting
menu-bar-lines and tool-bar-lines.  Use menu-bar-mode and
tool-bar-mode, which are now set using these X resources at
startup, to determine the defaults.