[gentoo-dev] [RFC] [epatch_user] Proposal: add possibility to tolerable-fail for some patches (plus add groupping support)

[Vadim A. Misbakh-Soloviov]

My idea is to allow failing for some patches without breaking build at all. And, in parallel, to 
add groupping.

How I imagine that:

etc/portage/patches/app-cat/<name>/
    |
    | - group_name/
    |     |
    |     |- 01_foo.patch
    |     |- 02_bar.patch
    |     |- <...>
    |
    |- 01_moo.patch
    |- 99_meow.patch

Where every first-level piece (patch or group) in ```etc/portage/patches/app-cat/<name>/``` MAY 
tolerably fail (not causing "die" for emerge), but if one of the patches inside the group fails, then 
group MUST NOT be applied at all (and all previously applied patches from this group MUST be 
reversed).


Any objections/approvals/suggestions?