gnu: qemu-kvm: Add patch to have multiple SMB shares.

* gnu/packages/qemu.scm (qemu-kvm/smb-shares): New variable.
* gnu/packages/patches/qemu-multiple-smb-shares.patch: New file.
* Makefile.am (dist_patch_DATA): Add it.

packages: Add `package-output'.

* guix/packages.scm (package-output): New procedure.
* tests/packages.scm ("package-output"): New test.

gnu: guile-static: Change `name' field.

* gnu/packages/make-bootstrap.scm (%guile-static): Add `name' field with
  `-static' suffix.

gnu: guile-static: Add bindings for `reboot'.

* gnu/packages/patches/guile-linux-syscalls.patch: Add `scm_reboot'.

gnu: qemu: Add dependency on Samba.

* gnu/packages/qemu.scm (qemu-kvm): Add dependency on Samba; pass
  `--smbd' to ./configure.

gnu: samba: Augment the RUNPATH of executables to point to $out/lib.

* gnu/packages/samba.scm (samba): Add `add-lib-to-runpath' phase, and
  PatchELF as an input.

gnu: Add GNU Parted.

* gnu/packages/parted.scm: New file.
* Makefile.am (MODULES): Add it.

gnu: guile-static: Add bindings for low-level Linux syscalls.

* gnu/packages/make-bootstrap.scm (%guile-static): Add
  `guile-linux-syscalls.patch' as an input, and use it.
* gnu/packages/patches/guile-linux-syscalls.patch: New file.
* Makefile.am (dist_patch_DATA): Add it.

gnu: linux-libre: Choose a config without debugging features.

* gnu/packages/linux.scm (linux-libre): Choose "defconfig" instead of
  "allmodconfig" since the latter enables all debugging features.  Add
  `CONFIG_CIFS=m'.

gnu: Add vim.

* gnu/packages/vim.scm: New file.
* Makefile.am (MODULES): Add it.

Build newest versions unless specified, and implement upgrades.

* gnu/packages.scm (find-newest-available-packages):
  New exported procedure.

* guix-build.in (newest-available-packages, find-best-packages-by-name):
  New procedures.
  (find-package): Use find-best-packages-by-name, to guarantee that
  if a version number is not specified, only the newest versions will
  be considered.

* guix-package.in (%options): Add --upgrade/-u option.
  (newest-available-packages, find-best-packages-by-name, upgradeable?):
  New procedures.
  (find-package): Use find-best-packages-by-name, to guarantee that
  if a version number is not specified, only the newest versions will
  be considered.
  (process-actions): Implement upgrade option.

* doc/guix.texi (Invoking guix-package): In the description of --install,
  mention that if no version number is specified, the newest available
  version will be selected.

Inhibit duplicates in fold-packages.

* gnu/packages.scm (fold2): New procedure.
  (fold-packages): Rework to suppress duplicates.

build-system/gnu: Make the strip behavior of `static-package' configurable.

* guix/build-system/gnu.scm (static-package): Add #:strip-all? keyword
  parameter.

gnu: guile-static: Use libgc build with `USE_LIBC_PRIVATES'.

* gnu/packages/make-bootstrap.scm (%guile-static): Use libgc build with
  CPPFLAGS=-DUSE_LIBC_PRIVATES.
* gnu/packages/bdw-gc.scm (libgc): Add TODO to always do it.

gnu: Add missing patch for mcron.

* gnu/packages/patches/mcron-install.patch: New file.
* Makefile.am (dist_patch_DATA): Add it.

gnu: Add GNU Wdiff.

* gnu/packages/wdiff.scm: New file.
* Makefile.am (MODULES): Add it.

Add version-compare and version>? to utils.scm.

* guix/utils.scm (version-compare, version>?): New exported procedures,
  based on version-string>?, which was formerly in gnu-maintenance.scm.

* guix/gnu-maintenance.scm (version-string>?): Removed procedure.
  (latest-release): Use 'version>?' instead of 'version-string>?'.

gnu: Add signing-party.

* gnu/packages/gnupg.scm (signing-party): New variable.

gnu: wget: Drop manual handling of /usr/bin/env.

* gnu/packages/wget.scm (wget): Drop patch-/usr/bin/env phase.

gnu: curl: Let patch-shebang handle /usr/bin/env.

* gnu/packages/curl.scm (curl): Drop manual rewriting of #!/usr/bin/env.