slang/README should be updated or rewritten

[Frédéric L. W. Meunier <lists pervalidus net>]

I think slang/README should be updated or rewritten. Something
like:

This is the S-Lang library, version 1.4.5.  It has been modified a 
little to make it work with the Midnight Commander. The complete
distribution can be downloaded from:

http://space.mit.edu/~davis/slang/
ftp://ftp.jedsoft.org/pub/davis/slang/

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