Correct some permission combinations on requests to Posts::get().  Specifically, correct combinations that previously would allow read access to posts that didn't qualify for a set deny access, but also didn't qualify for any grant.
Correct some permission combinations on requests to Posts::get().  Specifically, correct combinations that previously would allow read access to posts that didn't qualify for a set deny access, but also didn't qualify for any grant.

git-svn-id: d0e296eae3c99886147898d36662a67893ae90b2@3137 653ae4dd-d31e-0410-96ef-6bf7bf53c507

dragonmantank/Habari,dragonmantank/Habari,dragonmantank/Habari