Fixing error text
Fixing minor bug
Removing temporary python opal script
Adding GDCM details to build readme
Removing defunct methods
Fixing vtkXMLFileReader::ReadValue() method

This method was causing a problem when reading empty strings.
Merge remote-tracking branch 'dean/master'

Conflicts:
	build/CMakeLists.txt
Using SSL version 3 when using curl to communicate with Opal
Tweaking QSelectInterviewDialog
Merge remote-tracking branch 'patrick/master'