Changing type function to not blow up on nil, which makes a lot of code

simpler. A pseudo type code is introduced called NIL with value 0.

* lib.h (enum type): New enumeration value, NIL.
(type): Function accepts object nil and maps it to code NIL.

* eval.c (dwim_loc, op_dwim): test for nil obj and goto hack is gone,
just handle NIL in the switch.

* gc.c (make_obj, mark): Handle new NIL type code in switch.

* hash.c (equal_hash): Handle NIL in the switch instead of nil test.

* lib.c (code2type): Map new NIL type code to null.
(typeof, typecheck): Code simplified.
(class_check, car): Move nil test into switch.
(eql, equal, consp, bignump, stringp, lazy_stringp,
symbolp, functionp, vectorp, cobjp): Simplified.
(length, sub, ref, refset, replace, obj_print, obj_pprint): Handle NIL
in switch instead of nil test.  goto hack removed from refset.

* match.c (do_match_line, do_output_line): switch condition simplified.

* regex.c (regexp): Simplified.
(regex_nfa): Assert condition simplified.

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