GitLab

This commit moves the internal enzo reader to a
separate header. The reason for doing this is
primarily to allow the re-use of the internal enzo
reader for the corresponding particles reader.

Added support for selectively loading data arrays.

Adding vtkAMRFlashReader which implements
the vtkAMRBaseReader interface.

Updated AMR reader infrastructure, currently
consisting of the Enzo and Flash readers.
Still some ironing of the API is required...