* data/lalr1.cc (YYRHSLOC): New.
(YYLLOC_DEFAULT): Use it.
* data/glr.cc: If location_type was user defined, do not include
location.hh, and do not produce location.hh and position.hh.
* tests/calc.at (YYLLOC_DEFAULT): Use YYRHSLOC.
Check that glr.cc supports user defined location_type.
* NEWS: Document this.