Nettle: Added SALSA20R12 variant of SALSA20.
CHANGES: Added a few recent changes.

Also adjusted the formatting to be more consistent through out.
CHANGES: Moved around a few points.
AutoDoc: Improved documentation of some LFUNs.
Serializer: Added some more AutoDoc.
Builtin.Setter: Improved the documentation somwwhat.
NetUtils: Fixed typo in testsuite.