Trac 12985: make sage work with ecl compiled with unicode support
enable unicode in ecl
Merge branch 'develop' into ticket/12985-ecl_unicode

Conflicts:
	build/pkgs/ecl/checksums.ini
	build/pkgs/ecl/spkg-src
Trac 12985: update SPKG.txt, package-version.txt and spkg-src for ECL
Trac 17003: upgrade ECL to 13.5.1
Merge branch 'ticket/16908-maxima-5.34.1' into ticket/17003-ecl-13.5.1
Trac 17003: update docstrings
Poset product now also remembers labels, not only give abstract
structure.
Missing comma between command-line arguments
Revise documentation of 'make distclean'
Trac #17080: Bad compile flags for sage/matrix/matrix_modn_dense_double.pyx

A missing comma introduced by #16803.

Also remove unused imports and fix some formatting.

URL: http://trac.sagemath.org/17080
Reported by: jdemeyer
Ticket author(s): Jeroen Demeyer
Reviewer(s): Marc Masdeu
Trac #17060: Poset product forget labels

I except

{{{
Poset((['cat'],[])).product(Poset((['dog'],[]))).list()
}}}

to return `[('cat', 'dog')]` but got `[(0, 0)]`. Product of poset should
remember labels.

URL: http://trac.sagemath.org/17060
Reported by: jmantysalo
Ticket author(s): Jori Mäntysalo
Reviewer(s): Nathann Cohen
Trac #12985: Build ECL with unicode enabled

The current ECL spkg disables unicode support, while it is enabled
upstream.

New tarball:
http://pub.math.leidenuniv.nl/~bruinpj/sage/ecl-12.12.1.20140917.tar.bz2

URL: http://trac.sagemath.org/12985
Reported by: pcpa
Ticket author(s): Paulo César Pereira de Andradet
Reviewer(s): François Bissey
Trac #17003: Upgrade ECL to 13.5.1

A fairly straightforward upgrade.

Tarball: http://pub.math.leidenuniv.nl/~bruinpj/sage/ecl-13.5.1.tar.bz2

URL: http://trac.sagemath.org/17003
Reported by: pbruin
Ticket author(s): Peter Bruin
Reviewer(s): François Bissey
Trac #17083: very small change to documentation of 'make distclean'

Mention in the documentation for `make distclean` that it doesn't
destroy preexisting git branches.

URL: http://trac.sagemath.org/17083
Reported by: jhpalmieri
Ticket author(s): John Palmieri
Reviewer(s): Jeroen Demeyer