This commit just:
* combines the `complete/` and `active/` directories into one: `text/`
* renames all of the RFC text files to use their earliest associated
PR number as the RFC number.
A follow-on commit encodes the `active`/`complete` distinction into a
list in the README.md file, and fixes a few mistakes in the RFC files
that I encountered along the way.
Felix S. Klock II