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

[Yuan Fu]

Here is the new patch. New-store-window.patch contains the one allowing user 
store/restore window config. I added the two menu items. And I changed the name 
to gdb-save-window-layout and gdb-load-window-layout because I think they are 
shorter and easier to understand; WDYT?

Restore-after-quit.patch contain the patch which restores the  original window 
configuration after gdb quits. Maybe I should send it as a separate patch?

BTW, It used to be three commits, I merged the first one on window.el into 
new-restore-window.patch.

Yuan

new-store-window.patch
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restore-after-quit.patch
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