Do not update timed links and packages index when repo_rsync failed.

Mohammad AlSaleh authored Feb 17, 2016 and Seblu committed May 05, 2017

 pacsort is required to list packages in the right order.

 Example: `agetpkg  -l '^linux$' |tail`

 Before:
 linux 4.3.2-1 x86_64
 linux 4.3.3-1 x86_64
 linux 4.3.3-2 x86_64
 linux 4.3.3-3 x86_64
 linux 4.4.1-1 x86_64
 linux 4.4.1-2 x86_64
 linux 4.4-1 x86_64
 linux 4.4-2 x86_64
 linux 4.4-3 x86_64
 linux 4.4-4 x86_64

 After:
 linux 4.3.2-1 x86_64
 linux 4.3.3-1 x86_64
 linux 4.3.3-2 x86_64
 linux 4.3.3-3 x86_64
 linux 4.4-1 x86_64
 linux 4.4-2 x86_64
 linux 4.4-3 x86_64
 linux 4.4-4 x86_64
 linux 4.4.1-1 x86_64
 linux 4.4.1-2 x86_64

Signed-off-by: Mohammad AlSaleh <CE.Mohammad.AlSaleh@gmail.com>

Reserve the logic of syncing. Now it's a whitelist instead of a blacklist.
This allow us to use kitchensink_tier1 from rsync.al.org to fetch
the source tree, in order to complain with GPLv2 sources distribution.

It may append that rsync stall and don't quit. This add and housekeeper.

In order to prevent running as root or with different user, which
is complex with a lot of files, check user/group before run.

Since AUR4, rsync access has been deprecated

Do not fail when rsync repositories; try to sync iso and update links, etc.

Also display error message when other rsync call return != 0

Manage sync of repo and iso from the same rsync server

All archiving script are now functions into archive.sh.
Configuration is sourced from a archive.conf file.

iso http sync support was dropped.