[Users] Point relase of ET_2013_11 "Noether"

[Frank Loeffler]

Since its release, a few important corrections have been added to the current
version ET_2013_11 "Noether". In fact, one error in particular can lead
silently to wrong results, so we strongly suggest to update checkouts. Updating
is easy: from within your Cactus checkout (cd into it), execute

  ./bin/GetComponents -u

New tags for this "point release" have been created: ET_2013_11_v1, but it is
not recommended to use these for a checkout, to be able to easily receive
possible future updates. The tar ball has been updated as well.

In the following we briefly describe the changes included in this update.


The ET_2013_11 "Noether" release of the Einstein Toolkit contained an error in
Carpet which was introduced since the previous ET_2013_05 "Gauss" release. The
problem was related to synchronising ghost zones after data is restricted
(copied from fine grids to coarse grids). The problem has been observed to
result in incorrect data on coarse grids for multi-process runs with more than
2 refinement levels, and data on coarse grids which depends on the number of
processes used. This problem has now been fixed in the ET_2013_11 release
branch.  

The MoL integrator RK87 was not functional in the Noether release, triggering
an error message instead. This message was meant to warn that RK87 is not
implemented for grid arrays. However, this error message and abort was always
triggered, even for evolutions of only grid functions (the usual case). This
has been corrected, and now only triggers if evolutions of grid arrays are
requested with RK87.

In IDLinearWaves the calculation of one coeffient for the m=2 mode of the
Teukolsky waves was missing, resulting in usage of uninitialized memory for
that mode. This is not a regression from a previous release, but was included
in the point release because of its trivial and non-invasive fix.

Frank Loeffler for the Einstein Toolkit maintainers

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