paccheck: distinguish ENOENT from read errors

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
paccheck: only check filesystem values by request

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

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
paccheck: print success messages by default

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

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
paccheck: split type and mode checks

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
paccheck: fix get_depends -> get_optdepends typo

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
paccheck: move tests before backup file check

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
paccheck: extract backup file search

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