Do not try to execute a child with no command line.  Previously this led
to a silent hang.

Resurrecting something I wrote way back in November as an exmaple -
shows a QVTKWidget with a scene, and then a chart in it. The same data
shown in the chart is also shown in the table view.

BUG: When the truncated volume centroid is on a face, we give a precision error to orient the face in vtkGPUOpenGLRayCastMapper

Use a more standard way of computing face normal: vtkTriangle::ComputeNormal

Normals can't be transformed the same way than points/vectors can. They need to be transformed using the transpose of the inverse of the transform.
Use a small offset in front of the nearplane to make sure the planed is not clipped for no reason

This fixes a paraview bug that happens when viewing image slices on the client
when the data is processed on a parallel server.

The DynamicLoader::LibPrefix and DynamicLoader::LibExtension methods
previously hard-coded the module name components for each platform.  Set
them from the CMAKE_SHARED_MODULE_PREFIX and CMAKE_SHARED_MODULE_SUFFIX
CMake variables instead.  This ensures consistency in a program that
uses these methods to construct the file names for its own modules.

Modification time of vtkShader2Collection now depends of modification time of
the shaders. Without it, the shader program was not rebuilt when the code of
a shader was changed in the vtkGPUVolumeRayCastMapper like a switch from
perspective to parallel projection shader. Added a regression test for this
switch TestGPURayCastPerspectiveParallel.

Clarify doc on verbosity flags

Fixes text hover bug for graphs with only nodes.

Quadratic elements are now rendered correctly in ParaView.

If no threading library is available, vtkConditionVariable
defines some fake typedefs and functions that look like they
belong to the pthread library but really do nothing.  I ran
into a case while compiling for compute node linux (kind of
like cross compiling except that the target platform supports
a subset of functionality as the compiling node rather than
being a totally different architecture) where some include of
an include was including the pthreads header even though the
build does not support pthreads.  When vtkConditionVariable
tried to make its own pthread-like declarations, the compiler
barfed because there were multiple definitions.  This fix
simply places all these local definitions in a namespace.
This makes the multiple definitions distinguishable by the
compiler and at worst you should get a warning about shadowed
symbols.

The CopyFileIfDifferent, CopyFileAlways, CopyAFile and CopyADirectory
methods should always copy permissions.  The special cases in which a
caller would pass copyPermissions=false should be handled at the call
site.  The parameter needlessly complicates the interface and semantics
of these methods.

Rather than require people to create a passwordless account on a
mysql instance just for testing, I'm going to assume that they've
given it a password of 'vtktest'.  This is probably a good thing
to move into CMakeLists.

Please see the error description at
http://dev.mysql.com/doc/refman/5.0/en/null-mysql-store-result.html

This was actually coming up in practice for a user.

Wrong type used.

Add the SetProcessEvents method so that the user can disable
event processing on the vtkSplineWidget.