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2.7RC->Trunk, resolve #1647, clear python error upon failed attempt to call setattr in state object base class

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** Should still compile with older versions of Silo
** DBSet/GetDataReadMask interface changed to unsigned long long
** Added missing data support
** Added support for curves in polar coordinates defined by the file
** Added support for Label variables including arbitrary number of sub-variables in label variables
* Adjusted Label plot to support vtkCharArrays in addition to vtkUnsignedCharArrays
* Fixed misspellings in an error message in avtStructuredDomainBoundaries


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Move 'Set CMAKE_MODULE_PATH' call from root CMakelists to just before the call to find_package for numpy, to prevent a seg fault with cmake.

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if numpy is found during configure then libsim may be passed
numpy arrays directly. zero-copy transfer are supported via
numpy c-api. a new ownership type is introduced to support
safe zero-copy transfer of data to vtk data arrays. when this
ownership is requested a custom (potentially user provided)
callback is invoked by an internally arranged observer of vtk
data array delete event. the callback should free the memory.
this mechanism can be used in any zero-copy transfer through
libsim where c's free is not the correct function to free the
transfered memory, in the case of python and numpy, we make
use of python's ref counting to ensure the numpy object is not
destroyed until the vtk array is deleted. the numpy object's
ref count incremented (by libsim) as its passed in, libsim
provides a callback which decrements the object's ref count
when the vtk data array is deleted. aside from having to pass
the new ownership flag, this all happens transparently to the
user as it is implemented in libsim's python swig customizations.
If this were to be used in other situations, eg FORTRAN, the user
would be extected to provide the memory management callback.



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support system python on systems that use lib64. Also make
skip install default when using system installs for both
python and qt.



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Updated my config-site file.

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I added a fix from Pratick Fragile to the CosmosPP reader for an
enhancement he added. I didn't add anything to the release notes 
since the enhancement was for 2.7.2, which hasn't been released yet.



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I modified the visit-create-chksums script to once again checksum the
32 bit windows distribution.



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I moved a release note change description from the 2.8.0 release notes to 
the 2.7.2 release notes since the change was added to the 2.7RC. 



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I added a launch profile to the host profile for LLNL's zin system for 
using the pvis partition. I also added a blurb to the release notes about 
the change. This resolves #1731.



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I added a launch profile to the host profile for LLNL's max system
for using the pvis partition. I also added a blurb to the release notes
about the change. This resolves #1725.



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Fix bug applying named selection when 'Auto apply updated selections' was selected before selection was applied to a plot.

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I modified the MRTest database reader to set the cycle and time so that
PopulateDatabaseMetadata is only called once.



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