Add command upgrade with optional including tasks.

Add autoimports.p10 branch support.

Fix check branch with disttag in short form.
Remove disttag macro file during apt-repo rm.

Add p10 branch.

Add https to allowed apt protocols.

Added armh repo support.

Fix official source for c8 branch.

Add new repositories: c8.1, autoimports.p9 and altlinuxclub.p9.
Use proxy from APT for network operations (thanks asy@) (ALT #38294).
Set optional Arepo ignoring in file /etc/sysconfig/apt-repo (ALT #34167).
Fix License tag according to SPDX.

Add p9 branch.
Add --dry-run mode (ALT #35726).
Support to add archive of branch (ALT #30841).
Show and remove all non-commented and non-empty sources (ALT #30008).
Add key [<branch_name>] in addition to [updates] for branch source (ALT #32434).
Add arepo repository for added file: source.
Check task existance for apt-repo list task (ALT #34222).
Set new format only URL contains at least 3 parts.
Add new command `set` to remove all exising sources and add specified branch.

Add braches c8 and altlinuxclub.p8

apt-repo test: do not confuse "remote" package names with local dirs/files

Support https://www.altlinux.org/Autoimports sources

Fix process writing to file with permission denied

handle both cases without arepo: none (noarch) or empty (ALT #31577).
"apt-repo test [task] '' pkg1 ..." will install the packages without
-hsh-apt-config, this feature is useful

task_has_arepo(): check whether plan/arepo-add-x86_64-i586 is not
get rid of NO_TASK_AREPO_HACK environment variable (now, as