bug#39181: 27.0.50; [PATCH] Allow users to store & restore gdb-mi layout

[Yuan Fu]

Here’s the patch that addresses Štěpán and Martin’s review:

Apart from fixing all the mentioned issues, I also moved “Restore Window Layout” button from “GDB-MI” menu to “GDB-WINDOWS” menu, since it fits there better; I also mentioned that this button works for the new user-supplied default layout, too, if a user sets `gdb-default-window-configuration-file’. 

As for the layout vs configuration, I used “layout” in UI buttons, and used “window configuration (i.e. window layout)” in help echos. Hopefully the user will understand that we use “window configuration” internally but it’s (almost) the same as a window layout in gdb. This also plays well with existing UI that uses “layout”. The window layout that we save to a file in gdb is a window configuration structure with some small differences: simply loading that window configuration with `window-state-put' doesn’t give back your gdb layout. (because all the buffers (local, breakpoint, etc) are different from session to session.) `gdb-load-window-configuration` does some trick to recreate each buffers. Apart from that the layout and window configuration is the same thing.

Martin suggests to mention the layout vs window configuration in the manual, should I also document this new feature in the same section? (Let me learn texinfo first ;-)

Yuan

new-window.patch
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