gnu: tar: Skip tests that rely on undefined unlinkat(2) behavior.

Fixes <http://bugs.gnu.org/20597>.
Reported by Andrew Patterson <ajpatter@uwaterloo.ca>.

* gnu/packages/patches/tar-skip-unreliable-tests.patch: New file.
* gnu/packages/base.scm (tar)[source](patches): Add it.
* gnu-system.am (dist_patch_DATA): Add it.

gnu: gettext: Fix non-deterministic msgunfmt behavior.

Suggested by Alírio Eyng <alirioeyng@gmail.com>.

* gnu/packages/patches/gettext-msgunfmt.patch: New file.
* gnu/packages/gettext.scm (gnu-gettext)[source]: Use it.
* gnu-system.am (dist_patch_DATA): Add it.

gnu: make-bootstrap: Build libbacktrace, required by cc1.

Fixes <http://hydra.gnu.org/build/506982/nixlog/1/tail-reload>.

* gnu/packages/make-bootstrap.scm (%gcc-static): Remove
  --disable-libbacktrace.  It is needed by cc1-checksum.

gnu: make-bootstrap: Update patching of gawk's configure.

* gnu/packages/make-bootstrap.scm (%static-inputs)[gawk]: Change
  "-export-dynamic" to "-Wl,-export-dynamic" to account for current
  'configure' file.

gnu: make-bootstrap: Switch to GCC 4.9.

* gnu/packages/make-bootstrap.scm: Replace all occurrences of "gcc-4.8" with
  "gcc-4.9".
  (%gcc-static): Add --disable-libcilkrts, --disable-libvtv,
  --disable-libbacktrace.

gnu: openssl: Update to 1.0.2c.

* gnu/packages/openssl.scm (openssl): Update to 1.0.2c.

Merge branch 'master' into core-updates

Conflicts:
	gnu/packages/commencement.scm
	gnu/packages/xml.scm

gnu: gcc: Build libsanitizer's bundled libbacktrace without -Werror.

* gnu/packages/gcc.scm (gcc-4.7)[arguments]: Also patch
  libsanitizer/libbacktrace/Makefile.in.

gnu: openssl: Update to 1.0.2b.

* gnu/packages/openssl.scm (openssl): Update to 1.0.2b.

gnu: perl-net-ssleay: Disable test that fails with openssl-1.0.2b.

* gnu/packages/patches/perl-net-ssleay-disable-ede-test.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/openssl.scm (perl-net-ssleay): Add patch.

gnu: python: Disable ssl test that fails with openssl-1.0.2b.

* gnu/packages/patches/python-disable-ssl-test.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/python.scm (python): Add patch.

doc: Move most 'HACKING' informations into the manual.

* HACKING (Contributing): New section.
  (Building from Git, The Perfect Setup, Coding Style, Submitting Patches):
  Move to ...
* doc/guix.texi (Running Guix Before It Is Installed): Likewise.
* doc/contributing.texi: ... here. New file.
* doc.am (EXTRA_DIST): Use it.
* README (Installation): Adapt to it.
* configure.ac (DOT): Likewise.

ld-wrapper: Ignore .so files specified after "-plugin" for RUNPATH purposes.

Reported by Mark H Weaver
at <http://debbugs.gnu.org/cgi/bugreport.cgi?bug=20102#58>.

* gnu/packages/ld-wrapper.in (library-files-linked): Handle "-plugin"
  similarly to "-dynamic-linker".

gnu: guix: Wrap 'guix' so GUILE_LOAD_PATH includes the dependencies.

* gnu/packages/package-management.scm (guix-0.8.2)[arguments]: Add
  'wrap-program' phase.

gnu: guix: Use 'modify-phases'.

* gnu/packages/package-management.scm (guix-0.8.2)[arguments]: Use
  'modify-phases' instead of 'alist-cons-before'.

gnu: Add hydra.

* gnu/packages/ci.scm: New file.
* gnu/packages/patches/hydra-automake-1.15.patch,
  gnu/packages/patches/hydra-disable-darcs-test.patch: New files.
* gnu-system.am (GNU_SYSTEM_MODULES): Add file.
  (dist_patch_DATA): Add patches.

gnu: Add Catalyst-Authentication-Store-DBIx-Class.

* gnu/packages/web.scm (perl-catalyst-authentication-store-dbix-class):
  New variable.

gnu: Add Catalyst-Plugin-Authorization-Roles.

* gnu/packages/web.scm (perl-catalyst-plugin-authorization-roles): New
  variable.

gnu: Add Set-Object.

* gnu/packages/perl.scm (perl-set-object): New variable.

gnu: Add powertabeditor.

* gnu/packages/music.scm (powertabeditor): New variable.