Add record objects with user-defined types.
* src/alloc.c (allocate_record): New function. (Fmake_record, Frecord, Fcopy_record): New functions. (syms_of_alloc): defsubr them. (purecopy): Work with records. * src/data.c (Ftype_of): Return slot 0 for record objects, or type name if record's type holds class. (Frecordp): New function. (syms_of_data): defsubr it. Define `Qrecordp'. (Faref, Faset): Work with records. * src/fns.c (Flength): Work with records. * src/lisp.h (prec_type): Add PVEC_RECORD. (RECORDP, CHECK_RECORD, CHECK_RECORD_TYPE): New functions. * src/lread.c (read1): Add syntax for records. * src/print.c (PRINT_CIRCLE_CANDIDATE_P): Add RECORDP. (print_object): Add syntax for records. * test/lisp/emacs-lisp/cl-print-tests.el (cl-print-tests-2): New test. * test/src/alloc-tests.el (record-1, record-2, record-3): New tests. * doc/lispref/elisp.texi, doc/lispref/objects.texi, doc/lispref/records.texi: Add documentation for records.
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