pactrans: add pkgspec support

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
add pu_log_command

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
add pu_basename

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
pacsync: log command run

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
pactrans: document --download-only option

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
pactrans: log command run

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
pactrans: allow running as pacinstall/pacremove

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
add pacinstal/pacremove symlinks to pactrans

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>