lambda-set method: treat [struct ...] as place.

* eval.c (eval_init): Change registration of dwim-set to only
one required argument, with the rest variadic.

* lib.c (lambda_set_s): New symbol variable.
(dwim_set): Change to variadic function that takes all
arguments other than the object/sequence being operated on as
struct args *. Rewrite to do a test on the object type first,
handling hashes and structs specially.
(obj_init): Initialize lambda_set_s.

* share/txr/stdlib/place.tl (defplace dwim): Rewritten for
more generic syntax. The only argument required is obj-place;
the other arguments are treated as a variable argument list,
all treated uniformly.  This eliminates the special handling
of the default value for hash lookups.

* args.h (args_count): New inline function.

* txr.1: Updated documentation for dwim operator, which neglects
to mention use over objects thanks to the lambda function.
Documented lambda-set.

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