* strace.cc (toggle): New global variable.

* strace.cc (toggle): New global variable.
(error): Use exit instead of ExitProcess so that stdio buffers get flushed.
(create_child): Remove command line error checking.
(dostrace): Ditto.
(dotoggle): New function.
(usage): Add entry for new option -T|--toggle.  Alphabetize.
(longopts): Add new option -T|--toggle.
(opts): Ditto.
(main): Handle new -T|--toggle option.  Move all command line checking here
from other functions.
* utils.sgml: Update section for strace.