gnetlist: Don't use gettext macros.

Commit dcd9b1c6eb47 introduced a translatable string to gnetlist, but
in the stable-1.8 branch gnetlist is not yet internationalised.
build-sys: Require Automake 1.11 for developers.

A newer version of Automake is required in order to ensure that the
parallel test driver is available.

In newer versions of Automake, this new driver is used by default and
it's necessary to use

  AM_INIT_AUTOMAKE([serial-tests])

in order to get the (deprecated!) serial test driver currently used
throughout the geda-gaf package.  This doesn't provide a solution: at
the moment, we have the problem that 1) newer versions of Automake
choke on the test suite without the "serial-tests" option; 2) older
versions of Automake choke on the "serial-tests" option.

The only option available to retain the ability for all
currently-active developers to run the test suite is to port it to the
parallel test driver.  1.6.0 is too old; 1.11.0 was released in 2009
and seems to provide a reasonable balance between maturity, widespread
availability and features.  Note that users without Automake >= 1.11.0
will still be able to build tarballs, but will need to upgrade to
build from git.

(imported from commit 0dd51a48d23c2f45ce1040fceadf653dbba008e7)
build-sys: Ignore new build-tools installed by Automake 1.13.

(imported from commit 4d5db45a89ad35b37fcb894b27801f953ce28e94)
build-sys: Use GUILE_PKG_NAME instead of GUILE_PKG.

We previously stored the name of Guile's pkg-config module in a
variable called GUILE_PKG.  In recent releases of Guile 2.x, a
GUILE_PKG autoconf macro has been added which conflicts with this.  So
we need to use a different variable name instead.

(imported from commit 1c2f215ffa639f543a0ca1997c17cfbeffb76793)
build-sys: Use parallel tests with coloured output.

Note that changing this option means that `make check' and `make
distcheck' will fail until all the tests have been ported over.

(imported from commit c518fc9dc04f25c9cfbfed5d32444eb3168ed506)
build-sys: Use parallel tests for Scheme API.

(This makes the testsuite work again).

(imported from commit 0f3c4785ec997b9c04bdfc695192811f6c5eba43)
build-sys: Don't use Automake test driver unless actually necessary.

Most of the tests in geda-gaf actually provide their own test drivers
in the form of a shell script.  It's actually better just to run them
directly in a check-local rule than to use the Automake test driver
(which eats all the output now that parallel tests are being used).

(imported from commit b7a373f8846fa91c92e4a628e0691b7f865af3e0)
Update README with new Automake requirement.

(imported from commit 82c5b984ca51720ea8078aed326c31b37e4e3e33)
Update translations.
Update NEWS and version information for 1.8.2.