Updates to function docs.
Issue #1678140 by ultimateboy: Variable 'attachment_links_selection_()[type]' stores numeric field ID instead of field name.
Correct handling of convenience aliases
Adding code for convenience aliases - generates an alias for each node that allows quick downloading of files
Added a differentiator between private and public files. If it's private, instead of redirecting we serve the file in the current request
More descriptive user-facing titles for field formatters.
Minor formatting, comments, and made filesize estimate more conservative.
Adding icons to field formatters.
Adding preferred and newest field formatters for noderefs that point at content types with files.
Updating README
