* NEWS (2.3a+): Mention yesterday's state-removal change.

(2.3a): Remove the %language entry, which was added after 2.3a.
* src/LR0.c, src/closure.c, src/closure.h, src/conflicts.c,
src/conflicts.h, src/lalr.c, src/lalr.h, src/print.c,
src/print_graph.c, src/state.c, src/state.h, tests/conflicts.at,
tests/existing.at: Update copyright date.