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Sort the warnings by location (file, line number, column). They are built using an obstack then stored in a list, and finally sorted just before being printed, at the end. * src/complain.c, src/complain.h: New warning struct, obstack, and implementation * src/location.c, location.h (location_obstack_caret, location_obstack_print): New * src/main.c: Print the warnings * src/muscle-tab.c, src/reader.c, src/scan-code.l, src/symtab.c: Adapt for multi-part warnings * tests/actions.at, tests/conflicts.at, tests/existing.at, tests/input.at, * tests/reduce.at, tests/regression.at, tests/skeleton.at: Update testsuite