Update superbuild SWIG version to 2.0.9

Change-Id: Ie320fe737057802ee32500d09b401ff32d143023
BUG: Fix for as.array when swig is updated.

The next release of swig will fix the currently broken
class structure used by the bindings. This patch changes
the as.array call slightly to support the new class.

I've also corrected some exception messages in the
backet operator code.

Tested with the svn version of swig. All but the following
tests pass:
The following tests FAILED:
        338 - R.GaborSource (Failed)
        339 - R.GaussianSource (Failed)
        353 - R.GridSource (Failed)
        423 - R.PhysicalPointSource (Failed)

This patch should not be integrated without swig version being
updated.

Change-Id: If2b85da3488623e2e42d934b03f5a73a7d3f2e17
BUG: Fix R test of ImageSources

Fix out of bounds array access when not image inputs are provided.

Change-Id: I5306d51570b40baa4e8e4b8d9cfc69a8a317ffb1
Merge topic 'UpdateSWIG'

ae35b62 BUG: Fix R test of ImageSources
372f150 BUG: Fix for as.array when swig is updated.
331990f Update superbuild SWIG version to 2.0.9