Easyblock nwchem

Needed for NWChem version 6.3
Well, I looked into some of those examples file, and they will always fail (at lest with version 6.3), so why should we run them? And I am quite sure, that some of the tests were never run correctly with the previous versions (although I did not check them). For example, the (o)h3tr{3,4,5}.nw must run separately, and only (o)htr{1,2} must run sequentially. (Actually, the (o)h3tr2.nw is a restart of (o)h3tr1.nw. I could leave all the examples there but they will fail. 

Honestly speaking, the examples in some case are outdated, and sometimes are not even implemented. Better way is exist to make the test, but the results should be always manually re-checked, beacuse we might have some unsignificant digits changed, or some numerical value orders are changed. 

I can leave out the deletion part of the tests, but then it is not surprising that we have to set a limit for passed tests 50% or so.

Should I run all the tests then?