Use the correct configure option to use the internal libxml.
And keep the dependencies as close to the normal tool-chain versions as
possible.

dependency on a dummy-toolchain gettext instead of a run time dependency
on a toolchain gettext.

Add required dummy toolchain versions of gettext-0.19.6 and .7

The original problem is that when building libxml2 on a system with
liblzma installed by the distro, it picks up dependencies on lzma
routines. Some of the versions of Gromacs are linking against libxml2
statically, causing link errors agains lzma. And any other software that
does static linking against libxml2 will have the same problem.

There is a cyclic dependency between XZ, libxml2, and gettext.
Fix this by adding a dummy toolchain build of gettext without any
dependencies on anything.

XZ for the updated toolchains are then built with the
dummy-toolchain gettext as a build dependency.
And then normal toolchain builds of libxml2 (now with XZ dependency) and
gettext can be built against that XZ.

This was originally discussed in issue #3408.

{vis}[foss/2016a,intel/2016a] ParaView v4.4.0, ParaView v4.4.0

{lang,lib}[GCC/4.8.4] Python 2.7.9 (bare) + libxml2 2.9.2

add easyconfig libibmad-1.3.12-GCC-4.9.3-2.25.eb, add easyconfig libibumad-1.3.10.2-GCC-4.9.3-2.25.eb

enable running of tests for HPCG

make sure & check that Graphviz does not install Tcl bindings in Tcl install prefix

fix buildopts in tabix easyconfigs

{bio}[intel/2016b] tabix v0.2.6

disable testing in all ParaView 4.4.0 easyconfigs, don't hard specify optarch: True

{phys,vis}[intel/2016b] ncview v2.1.7, UDUNITS v2.2.20

* origin/develop:
  more remarks
  Drop tests (takes too long)
  Fix typo in Theano
  Add forgotten dep: nose-parameterized
  Added Theano/0.8.2 for intel/2016b + Python 3.5.2
  remove --with-tcl-config/--with-tk-config from R easyconfig, already done in R easyblock
  removed build statistics
  add easyconfig Java-1.6.0_24.eb
  GStreamer and GST-plugins-base 0.10 versions
  resolve dep conflicts
  add easyconfig Boost-1.61.0-foss-2016b.eb, add easyconfig GROMACS-5.1.4-foss-2016b-hybrid.eb, add easyconfig GROMACS-5.1.4-foss-2016b-mt.eb
  expat and GST version
  newline removed
  removed comments
  wxPython with foss2016a