doc: "filesystem" -> "file system"

* doc/guix.texi: "filesystem" -> "file system"
* gnu/packages/admin.scm: "filesystem" -> "file system"
* gnu/packages/cdrom.scm: "filesystem" -> "file system"
* gnu/packages/compression.scm: "filesystem" -> "file system"
* gnu/packages/disk.scm: "filesystem" -> "file system"
* gnu/packages/gnome.scm: "filesystem" -> "file system"
* gnu/packages/irc.scm: "filesystem" -> "file system"
* gnu/packages/linux.scm: "filesystem" -> "file system"
* gnu/packages/mail.scm: "filesystem" -> "file system"
* gnu/packages/mpd.scm: "filesystem" -> "file system"
* gnu/packages/ocaml.scm: "filesystem" -> "file system"
* gnu/packages/perl.scm: "filesystem" -> "file system"
* gnu/packages/python.scm: "filesystem" -> "file system"
* gnu/packages/search.scm: "filesystem" -> "file system"
* gnu/packages/tls.scm: "filesystem" -> "file system"
* gnu/services/mail.scm: "filesystem" -> "file system"

gnu: Add mcelog.

* gnu/packages/linux.scm (mcelog): New variable.

gnu: kernel-config: Find configuration file for i686.

* gnu/packages/linux.scm (kernel-config): Find configuration file for
  i686.
  (make-linux-libre)[origin]: Apply patch correctly.

gnu: kernel-config: Remove redundant file-exists? check.

* gnu/packages/linux.scm (kernel-config): Remove redundant file-exists?
  check.

gnu: make-linux-libre: Only use configuration-file when one is provided.

* gnu/packages/linux.scm (make-linux-libre): Only use configuration-file
  when one is provided.

gnu: module-init-tools: Move to (gnu packages linux).

* gnu/packages/linux.scm (module-init-tools): Move.

gnu: libnfsidmap: Move to (gnu packages linux).

* gnu/packages/linux.scm (libnfsidmap): Move.

gnu: Add linux-libre-beagle-bone-black.

* gnu/packages/linux.scm (linux-libre-beagle-bone-black): New variable.

gnu: Add linux-libre-arm-generic.

* gnu/packages/linux.scm (linux-libre-arm-generic): New variable.

gnu: linux-libre: Use kmod.

* gnu/packages/linux.scm (make-linux-libre): Use kmod.

gnu: make-linux-libre: Add supported-systems parameter.

* gnu/packages/linux.scm (make-linux-libre): Add supported-systems
  parameter.

gnu: make-linux-libre: Add zImage to output.

* gnu/packages/linux.scm (make-linux-libre): Add zImage to output.

gnu: make-linux-libre: Add extra-version parameter.

* gnu/packages/linux.scm (make-linux-libre): Add extra-version option.

gnu: make-linux-libre: Add extra-options parameter.

* gnu/packages/linux.scm (linux-libre): Use
  %default-extra-linux-options.
  (config->string, %default-extra-linux-options): New variables.

gnu: Use make-linux-libre.

* gnu/packages/linux.scm (make-linux-libre): New variable.
  (linux-libre, linux-libre-4.4, linux-libre-4.1): Use make-linux-libre.
  (kernel-config): Take arch instead of system.

gnu: linux-libre: Add support for cross-compilation.

* gnu/packages/linux.scm (linux-libre): Add support for
  cross-compilation.

gnu: linux-libre: Move kernel configuration to configure phase.

* gnu/packages/linux.scm (linux-libre)[arguments]: Add configure phase.

gnu: linux-libre: Apply %boot-logo patch in origin.

* gnu/packages/linux.scm (linux-libre)[origin]: Apply %boot-logo patch
  in origin.

gnu: linux-libre: Use system->architecture.

* gnu/packages/linux.scm (linux-libre): Use system->architecture.

gnu: linux-libre: Use modify-phases.

* gnu/packages/linux.scm (linux-libre): Use modify-phases.