Need a permission option that respects node_access permissions

In order for this to tie in better with the og_linkchecker module we need to have either the LC_HIGHLIGHT_PERM respect node access permissions, or have an intermediary permission that respects node access permissions. Otherwise a group owner that has LC_HIGHLIGHT_OWN_PERM will only see broken links for nodes that he owns, not all nodes in the group, and a group owner that has LC_HIGHLIGHT_PERM will see all broken links anywhere in the site, indeterminant of whether he has permission to edit that node and fix the broken link.

I have created a patch that adds a third permission (LC_HIGHLIGHT_NODE_ACCESS_PERM) that respects node access and only shows the user node he or she has permission to update. I'll include the patch in the next post.