Bug#613724: grub2-splashimages: README documentation needs update

[Osamu Aoki]

Control: retitle -1 README documentation needs update

Since this gives beutiful boot screen and I have been using this
package, I kind of want this to be around in future.  But this does't
seem to be getting love. It is true this README needs update.  But
package update can't be offered as "it works for me" solution.

In this sense, updated README shouldn't suggest to edit files in /usr.
That kind of solution should never be in README.

Proper way is adding following line at the end of /etc/default/grub
GRUB_BACKGROUND="/usr/share/images/grub/Lake_mapourika_NZ.tga

Alternatively, you can drop Lake_mapourika_NZ.tga in /boot/grub and do
nothing for /etc/default/grub.

Either case, you need to run update-grub.

These are documented in grub but not so obvious.  So having this
example data with easy to use instruction in README is nice to have.

(The above mentioned approaches work on stable version of grub.  It
seems grub-efi-amd64 in testing doesn't handle tga format nicely at
this moment.  It works with PNG and JPG at least as I test it now.
This tga issue is my headache and beyongd me.  If this bug is fixed in
grub-efi-amd64, I may do NMU of grub2-splashimages describing this
proper method if no one objects.)

The updated README should be mostly on 
  https://bugs.debian.org/613724
  https://bugs.debian.org/635545

Other points for bugs on this package may also addressed by this simple
documenation update:

commons25ga.pl: https://bugs.debian.org/719311
The value of this fetch and tga format conversion program is gone.
 grub can handle jpeg, png, ....  So just download it to g
rub accessible directory and use GRUB_BACKGROUND or move it
to /boot/grub.

update-alternative: https://bugs.debian.org/673088
This is certainly an wishlist.  But looking at the amount of resources
available to keep this package in sync with grub package changes, I
think such effort is over engineering.  Let's keep it simple by this
above mentioned methods.

Additional images: https://bugs.debian.org/873629
I kinda like frog image in this bug report.  I actually tested grub
with one of the jpg in this bug report.  Since action needed is so
simple as just moving it to /boot/grub directory, my question is should
we need to make this package bigger?  What criteria to use to srlect
image.  I think adding text to README to point people to wikimedia
should be enough.  No more file format conversion is needed with
current grub.  I encourage this submitter to upload his image to
wikimedia site etc.:
 * 
https://commons.wikimedia.org/wiki/Category:Commons_featured_desktop_backgrounds
 * 
https://commons.wikimedia.org/wiki/Category:Commons_featured_widescreen_desktop_backgrounds