remove vmtkimagereader InputDirectoryName option #220
This is an immediate removal of both the python and c++ code which
This is an immediate removal of both the python and c++ code which handled reading in dicom files specified from a directory name. This was performed for a number of reason: 1) it is now best practice to use the ITKIO module for loading files. This utility can be generally regarded as being more accurate (by keeping translation and rotation matrices aligned). 2) incompatibility with VTK 8.1.0. With c++ 14 onwards and VTK 8.1.0+, the forward declarations in the vtkDICOMImageReader.h were somehow overriding the full definitions when we included the DICOMParser.h files in our derived class. 3) Using a simple directory name can lead to ambiguity if there is more than one dicom image series in a directory. This is handled transparently by ITKIO by requiring that the exact file/series desired is specified.