New macros: each-true, some-true, each-false, some-false.

* lisplib.c (arith_each_set_entries): Trigger autoload on
new symbols.

* stdilb/arith-each.tl (sys:arith-each): Generalize macro to
handle short-circuiting logical operations. The op-iv
parameter, which is a cons, is spread into two op and iv
parameter.
One new argument appears, short-circ. This specifies a code
for short-circuiting behavior: t means iteration continues
while the result is true; nil means it continues while it is
nil, and + means iteration continues while the accumulator is
nonzero. A new convention is in effect: the operator has
to be specified as a list in order to request accumulating
behavior, e.g (+) or (*). Otherwise the operator specifies a
predicate that is applied to the forms, without taking into
account the prior value.
(sum-each, sum-each*, mul-each, mul-each*): Spread the op-iv
arguments. Wrap the op argument in a list to request
accumulation. In the case of mul-each and mul-each*, specify +
for the short-circ argument, which means that iteration stops
when the accumulator becomes zerop. sum-each and sum-each*
specify : for the short-circ argument which is unrecognized,
and so ther is no short-circuiting behavior.
(each-true, some-true, each-false, some-false): New macros.

* tests/016/arith.tl: New tests.

* txr.1: Documented new macros and added note about possible
short-circuiting in mul-each and mul-each*.

* stdlib/doc-syms.tl: Updated.

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