Update license date on all files. No functional changes.
Changes for adding "const" qualifiers. These are mostly good things and
not C++ specific.
Include __BEGIN_DECLS and __END_DECLS (i.e., extern "C" blocks) to play
well with C++.
Update licenses to 2017.
Update license. No code changes.
Include copyright in all files. There are scripts to do bulk
replacement of the copyright if desired.
Add routines to translate to/from syslog priority and facility names.