Pressflow 7.59

[mparker17]

This is a security update. Please review.

Please create a tag after merging into the main repo.

/cc: @davidstrauss @elliotttf @fluxsauce @joshkoenig @nnewton @toddross

[fluxsauce]

Code review looks good to me, not in a position to functionally review though.

[generalredneck]

All is well... noninvasive on standard destination query strings. Pulling it in.