MFC r346571,r346572:

Update the spelling of my name

Previous spellings of my name (NGie, Ngie) weren't my legal spelling. Use Enji
instead for clarity.

While here, remove "All Rights Reserved" from copyrights I "own".

MFC r322291: du(1): Add --si option to display in terms of powers of 1000

MFC r319850:

Add some initial basic tests for du(1)

Tests that exercise the following flags are added in this commit:
- -A
- -H
- -I
- -g
- -h
- -k
- -m

Additional tests will be added soon.

Add some initial basic tests for du(1)

Tests that exercise the following flags are added in this commit:
- -A
- -H
- -I
- -g
- -h
- -k
- -m

Additional tests will be added soon.

MFC after: 1 month