grub-mkstandalone: reduce sharp edges #148
                
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It is a major foot gun that grub-mkstandalone silently drops files. As a first step, we can improve documentation and add warn messages.
PS: I'm aware that this is a RO mirror. I just wanted to save this for better google-ability for others. I'm going to contribute this the regular way soon, hopefully. (Guidance, please?) Or can one you, the maintainers, just copy, paste, and apply the patch?
PPS: I have to build and test this locally as well (WIP).