Revert "Prevent gdcm::Reader copy"

This reverts commit 13b4ea434586046cc658e50c9f88b38d2136c13e.
Revert "Prevent gdcm::Reader copy"

This reverts commit 13b4ea434586046cc658e50c9f88b38d2136c13e.

Conflicts:
	Source/DataStructureAndEncodingDefinition/gdcmReader.h
Merge branch 'release'

Conflicts:
	Source/DataStructureAndEncodingDefinition/gdcmReader.h