Recommendation is to avoid using the year nomenclature as this
information is already encoded in the git repo. Avoids needing to
repeatly update.
Also updates AUTHORS.txt from current repo with contributor names
It doesn't even use the forward-declared
SYMBOL_LIB_TABLE.
Including this pulls in the whole richio system,
and sch_symbol.h is a very-included header.
Quite a few things do use SYMBOL_LIB_TABLE, but nowhere
near as many as use SYMBOL.
