Rename `diff_set` -> `diffset`, etc.

Review Request #9994 — Created May 31, 2018 and submitted — Latest diff uploaded

Information

Review Board
release-4.0.x
0067603...

Reviewers

This patch renames the model files for DiffSet, FileDiff, and
DiffSetHistory to treat Diff{...} as a single word in the filenames.
All docstrings have been udpated to refer to the new location.

Ran unit tests.

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