Converted to Racket module system. WIP.
Converting to mutable.
Removed quotation on pretty printing
Using pretty-write instead of setting print-as-expression to false.
Fixed residual program generation.
Fixes in arity raiser  ansd generator.
Changed "starting" module. Removed redundant files.
Changed starting modules in subdirs. Removed redundant files.
Changed unmix.txt and renamed to readme.txt

--HG--
rename : unmix.txt => readme.txt
Merge branch 'master'