Note broken apt module
Default PE install contains an apt module that is "broken" in that it depends on stdlib functions that are not present in the supported version of stdlib, which we ship. Also notes workaround.
This update got orphaned in the run-up to PE 3.0! Well, better late than never.
These files were retrieved from an extremely messy WIP branch (nfagerlund/ssl_reform), where it made more sense to throw out any existing history and start with the semi-final product.
(maint) Fix link from 3.5 to 3.x reference guides
The 3.5 reference guide linked to `/puppet/3.0/reference`, but the documentation is actually served from `/puppet/3/reference`.
The RC was very nearly final, and no references were touched in the remaining commits.