Merge remote-tracking branch 'origin/maint'

Merge remote-tracking branch 'origin/maint'

* origin/maint:
  tests: more uniformity.
  tests: handle locations in a more generic way.
  tests: handle locations in the generic yyerror functions.
  tests: fix AT_CHECK_CALC.
  tests: improve infrastructure
  tests: factor.
  skeletons: minor style changes
  tests: AT_LANG.
  c skeletons: factor the declaration of yylloc and yylval.
  news: condemn YYPARSE_PARAM and YYLEX_PARAM.
  maint: regen.

Conflicts:
	tests/calc.at
	tests/local.at
	tests/regression.at