monads: Move '%store-monad' and related procedures where they belong.
This turns (guix monads) into a generic module for monads, and moves the
store monad and related monadic procedures in their corresponding
module.
* guix/monads.scm (store-return, store-bind, %store-monad, store-lift,
text-file, interned-file, package-file, package->derivation,
package->cross-derivation, origin->derivation, imported-modules,
compiled, modules, built-derivations, run-with-store): Move to...
* guix/store.scm (store-return, store-bind, %store-monad, store-lift,
text-file, interned-file): ... here.
(%guile-for-build): New variable.
(run-with-store): Moved from monads.scm. Remove default value for
#:guile-for-build.
* guix/packages.scm (default-guile): Export.
(set-guile-for-build): New procedure.
(package-file, package->derivation, package->cross-derivation,
origin->derivation): Moved from monads.scm.
* guix/derivations.scm (%guile-for-build): Remove.
(imported-modules): Rename to...
(%imported-modules): ... this.
(compiled-modules): Rename to...
(%compiled-modules): ... this.
(built-derivations, imported-modules, compiled-modules): New
procedures.
* gnu/services/avahi.scm, gnu/services/base.scm, gnu/services/dbus.scm,
gnu/services/dmd.scm, gnu/services/networking.scm,
gnu/services/ssh.scm, gnu/services/xorg.scm, gnu/system/install.scm,
gnu/system/linux-initrd.scm, gnu/system/shadow.scm, guix/download.scm,
guix/gexp.scm, guix/git-download.scm, guix/profiles.scm,
guix/svn-download.scm, tests/monads.scm: Adjust imports accordingly.
* guix/monad-repl.scm (default-guile-derivation): New procedure.
(store-monad-language, run-in-store): Use it.
* build-aux/hydra/gnu-system.scm (qemu-jobs): Add explicit
'set-guile-for-build' call.
* guix/scripts/archive.scm (derivation-from-expression): Likewise.
* guix/scripts/build.scm (options/resolve-packages): Likewise.
* guix/scripts/environment.scm (guix-environment): Likewise.
* guix/scripts/system.scm (guix-system): Likewise.
* doc/guix.texi (The Store Monad): Adjust module names accordingly.
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