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Co-authored-by: Marc Cornellà <hello@mcornella.com>

- Added follow redirects curl flag to fix the 301 response
- Updated trusted users URL format
- Changed from `pgp.mit.edu` keyserver to `keyserver.ubuntu.com` keyserver

Co-authored-by: Marc Cornellà <marc.cornella@live.com>

Co-authored-by: Magnus Boman <Kattus@users.noreply.github.com>

See https://bugs.debian.org/871816

Fixes #6592

* Added trizen to the archlinux plugin

trizen is the recomended solution for using the Arch User Repository.
both yaourt and pacaur have some issues.

Signed-off by: Arthur Brainville (Ybalrid) <ybalrid@ybalrid.info>

* Add trizen aliases to the readme

Also fixed inconsistency in formatting on readme file.
(also added myself in the contributor list)

Co-authored-by: dalu <2694548+dalu@users.noreply.github.com>

`pacaur -Syua` only updated AUR pakcages, wihch is incompatible with semantics of `pacupg` and `yaupg`. Removing `-a` here it would work for both main repos and aur.

Also make all functions local as to not spill variables into the
global namespace.

Signed-off-by: Marc Cornellà <marc.cornella@live.com>

  The command 'which' launches an external process that isn't
  really necessary.

oops

With these simple changes the plugin checks for the local AUR database and updates the aliases so it can update it when you issue a `pacupd` or `yaupd`.

* yaupg now also updates AUR packages
* Add yalst alias : it lists the installed packages, even from AUR
* Add yaorph alias : it removes orphans using yaourt