Second argument optional in trunc.

* arith.c (trunc1): New static function.
(trunc): Detect a missing second argument and call func1.

* eval.c (eval_init): Update registration of trunc
intrinsic to make second arg optional.

* txr.1: Describe optional argument of trunc. Trunc documentation
is merged with the floor, ceil and round section.
The mod and trunc-rem functions are split off into their own
sections, leaving the / function described by itself.
The documentation of / is substantially revised.

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