bournish: 'ls' adjusts the column width depending on the entries.

* guix/build/bournish.scm (display-tabulated): Remove #:columns and
  #:column-width parameters.  Add #:terminal-width and #:column-gap.
  Compute COLUMN-WIDTH and COLUMNS.

bournish: 'ls' lists directory contents.

Suggested by Ricardo Wurmus.

* guix/build/bournish.scm (ls-command-implementation): When FILE is a
directory, list its contents rather than FILE itself.

gnu: php: Add '--with-mysqli' configure option.

* gnu/packages/php.scm: Add '--with-mysqli' configure option.

gnu: php: Remove '--enable-threads' configure option.

* gnu/packages/php.scm (php): Remove '--enable-threads' configure option, as
  it is no longer recognized in PHP 7.

gnu: emacs-key-chord: Set source file-name.

* gnu/packages/emacs.scm (emacs-key-chord)[source]: Add file-name field.

gnu: emacs-transpose-frame: Set source file-name.

* gnu/packages/emacs.scm (emacs-transpose-frame)[source]: Add file-name field.

gnu: emacs-goto-chg: Set source file-name.

* gnu/packages/emacs.scm (emacs-goto-chg)[source]: Add file-name field.

import: pypi: Robustify latest-release.

* guix/import/pypi.scm (latest-release): Check if pypi-fetch has
  failed. If so return #f, else construct the <upstream-source>.

import: cran: Robustify cran-package?.

* guix/import/cran.scm (package->upstream-name): Return #f if url
  start and end index could not be determined.
  (cran-package?): Check if the upstream-name can be extracted from
  given package.
* tests/cran.scm: Add "r-minimal is not a cran package" to make sure that
  r-minimal is not detected as a cran package.

This fixes a failure of guix refresh on r-minimal because no
upsteam-name can be determined from ".../R-version.tar.gz" uri.

gnu: python-termcolor: Fix uri.

* gnu/packages/python.scm (python-termcolor): Remove "python-" from
  pypi uri.

This was causing guix refresh to fail on this package.

.gitignore: Ignore Emacs auto-save files.

* .gitignore: Add entries for temporary files created by Emacs.

Co-authored-by: Alex Kost <alezost@gmail.com>

system: Export 'read-boot-parameters'.

This partially reverts commit 9530e73b496fefe65dcb936825b6beda79f7fdf2.

* gnu/system.scm: Export 'read-boot-parameters' for backward compatibility.

gnu: gimp: Update to 2.8.22 [fixes CVE-2007-3126].

* gnu/packages/gimp.scm (gimp): Update to 2.8.22.

gnu: Add e3.

* gnu/packages/text-editors.scm (e3): New variable.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>

scripts: Do not create the config directory.

This fixes runs of 'guix package' and 'guix system' tests in
environments where $HOME is read-only.

* guix/ui.scm (config-directory): Add #:ensure? parameter and honor it.
* guix/scripts.scm (warn-about-old-distro): Pass #:ensure? #f to
'config-directory'.

doc: Update "Limitations".

* doc/guix.texi (Limitations): Mention LXDE; increase the package
count; reword sentence about services.

tests: "basic" test loads (guix …) modules from the right place.

This is a followup to 7561881f2a5d2dc463c24713745eca03e67044bf.

* gnu/tests/base.scm (run-basic-test)["/run/current-system is a GC
root"]: Remove 'set!' statements, add 'add-to-load-path' statement for
GUIX.

tests: Strengthen GC root test.

* gnu/tests/base.scm (run-basic-test)["/run/current-system is a GC
root"]: Check for a specific return value, 'success!.

gnu: reptry: Fix build.

* gnu/packages/patches/reptyr-fix-gcc-7.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add new patch.
* gnu/packages/screen.scm (reptyr): Use patch.

gnu: postgresql: Update to 9.6.3 [fixes CVE-2017-{7484,7485,7486}].

* gnu/packages/databases.scm (postgresql): Update to 9.6.3.