Fixed buiding SimpleView example

Change-Id: I9c7f30ccff1ae9fed6ba48400c11d211abc26035
Enable the Qt examples, update their build systems

Some of them hard coded paths to data in VTKData that no longer exists,
I verified that they build and run locally (Linux 64 bit).

Change-Id: Iff8d0b043d5a91dc94c27e1cf131b69fb0554cef
Use doubles to store GDAL point coordinates.

By default, `vtkPoints` uses a `vtkFloatArray` to store coordinates.
Because many geographic datasets use statute feet from a datum
for coordinates, large coordinate offsets use much of the available
floating-point precision. This commit changes the underlying storage
to a `vtkDoubleArray` to avoid roundoff issues.

Change-Id: I48c60b9b0af4c4890a2f1b9b18c3a5ad666ef6ce
Merge topic 'example-simple-view' into master

a4cce567 Enable the Qt examples, update their build systems
ab1aab29 Fixed buiding SimpleView example
Merge topic 'gdal-point-precision' into master

0fb084b2 Use doubles to store GDAL point coordinates.