Retry removals that fail

This partly resolves removal of packages that other packages depend on.
Ie. package A depends on B, but B was first on the command-line, so it
will fail to be removed. Now it'll let B fail, then remove A, then
retry B.

This won't resolve large dependency trees, but will work for the
majority of packages (most of which will only have 1-2 layers of
dependencies).
Added LIXUZ_ACL_DEBUG

Does a cluck when $c->debug is true and the LIXUZ_ACL_DEBUG environment
variable is set, in order to trace where the access attempt is coming
from.
Include the denied resource as a HTML comment
Don't perform write checks for read-mode

A writecheck will deny access, even if the user has access to read the article,
just not write to it (and read access is already tested).