gnu: Add r-optparse.

* gnu/packages/bioinformatics.scm (r-optparse): New variable.

gnu: Add r-getopt.

* gnu/packages/bioinformatics.scm (r-getopt): New variable.

gnu: Add GHC 8.0.1.

* gnu/packages/haskell.scm (ghc-8): New variable.

gnu: Add ghc-hashtables.

* gnu/packages/haskell.scm (ghc-hashtables): New variable.

gnu: Add ghc-easyplot.

* gnu/packages/haskell.scm (ghc-easyplot): New variable.

gnu: Add ghc-hmatrix-gsl-stats.

* gnu/packages/haskell.scm (ghc-hmatrix-gsl-stats): New variable.

gnu: Add ghc-hmatrix-special.

* gnu/packages/haskell.scm (ghc-hmatrix-special): New variable.

gnu: Add ghc-hmatrix-gsl.

* gnu/packages/haskell.scm (ghc-hmatrix-gsl): New variable.

gnu: Add ghc-hmatrix.

* gnu/packages/haskell.scm (ghc-hmatrix): New variable.

gnu: Add ghc-storable-complex.

* gnu/packages/haskell.scm (ghc-storable-complex): New variable.

gnu: Add chez-fmt.

* gnu/packages/chez.scm (chez-fmt): New variable.

gnu: Add chez-irregex.

* gnu/packages/chez.scm (chez-irregex): New variable.

gnu: Add chez-matchable

* gnu/packages/chez.scm (chez-matchable): New variable.

gnu: Add chez-sockets

* gnu/packages/chez.scm (chez-sockets): New variable.

gnu: Add chez-web

* gnu/packages/chez.scm (chez-web): New variable.

gnu: Add chez-srfi.

* gnu/packages/chez.scm (chez-srfi): New variable.

gnu: chez-scheme: Move to new module.

* gnu/packages/scheme.scm (chez-scheme, nanopass, stex): Move variables ...
* gnu/packages/chez.scm (chez-scheme, nanopass, stex): ... here. New module.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add new file.

gnu: chez-scheme: Fix i686 build.

* gnu/packages/scheme.scm (chez-scheme): Add 'configure-flags', generalize
  'configure' phase and simplify 'install-doc' phase.

gnu: chez-scheme: Add search-path.

* gnu/packages/scheme.scm (chez-scheme)[native-search-paths]: New field.

build: Remove reference to nonexistant patch file.

* gnu/local.mk: Remove reference to kobodeluxe-spelling.patch,
  which was removed during a revision to the submitted kobodeluxe package.