Patch renaming: cover letter

Patchbomb (more than 450 csets, one per package), including Yann's
change updating the documentation.

This series has been done using this script [1].
Here is the list of all the changes done [2]; and here, the short list
[3] containing only the patches whose the sequence number has been
added or updated (to get unique sequence number, and avoid sequence
number to be 0 which should not break any package since there is
currently no quilt series file in the Buildroot tree and AFAICS there is
no package conditonally patching its sources).

TODO:
- remove package version in patch file names
- rename *.patch.${ARCH} and *.patch.conditional patches

[1] http://code.bulix.org/mgwv3g-87272
[2] http://code.bulix.org/izkytc-87275
[3] http://code.bulix.org/cdlpy8-87276

Signed-off-by: Samuel Martin <s.martin49@gmail.com>