Interface does not support gcc 8.2

[Rombur]

I tried to compiled DTK with gcc 8.2 but I get tens of error from the Interface package. There are all similar to the one below

DataTransferKit/packages/Interface/test/tstUserApplication.cpp:408:27:
error: passing ‘const DataTransferKit::View<long long int>’ as ‘this’ argument discards
 qualifiers [-fpermissive]        
         global_dof_ids[n] = n + offset;

Interface is the only package which doesn't work. If I comment all the bugged lines, I can compile everything else and pass the tests.