NACHA - make portable. Eliminate daffodil-master branch.

Once DFDL-1006 is fixed, then NACHA can be made portable by adding a config that sets the needed tunable.

There is one other changes between the XSDs in master branch (IBM's branch) and the daffodil-master branch.

• textStandardExponentRep - NACHA schema has deprecated historic name textStandardExponentCharacter. IBM DFDL parser 10.0.0 doc online suggests that the new name is accepted now, so this should just be changed to use the "Rep" one, which Daffodil requires also.

Moving the files around to match the sbt "shape" i.e., src/main/resources etc. should be avoided if possible - can we tweek the build.sbt to look for the resources in different directories?

Before we merge branches we should have S. Hanson of IBM scrutinize the merged thing.