Draft R6RS

Actually it's called R^5.91RS: Revised^5.91 Report on the Algorithmic Language Scheme. As far as I was concerned, some long desired features were addressed, such as library, Unicode, hash-table, etc. I do prefer a small language with extensible libraries, however, interoperability of different Scheme implementations remains a significant problem. Besides, I've seen a new I/O library but still no plan for networking and some other facilities, though they may not be the targets right now.