* signal.c (sig_handler): Pass two arguments to signal

handler rather than 1. The new argument is the value t,
telling the handler that it's asynchronously invoked in
a real signal context. If the signal handler returns
true, then mark it deferred so that it can re-trigger
in a synchronous context.
(sig_check): Pass nil as a the second argument to signal handlers,
indicating that they are synchronously called, not
in a signal handler context.

* txr.1: Added documentation.

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