Add man pages
Add some missing license notices To avoid potential ambiguity. skeinsum is GPL-3.0-or-later.
Remove SHA3 references Skein was one of the finalists in the NIST competition to develop a new hash function called SHA-3. Skein made it all the way through to the end but was ultimately not selected. Since skeinsum uses the reference implementation that was submitted to NIST for the SHA-3 competition it contained references to SHA3. This commit removes them, since Skein wasn't selected and isn't SHA-3.
Updating skeinsum with a new scheme for reading large files, simplifying command line parsing and filebuilding, consolidating source code, etc.
Importing skeinsum