Stand-alone application support.

* txr.c (sysroot_init): Don't print "unable to calculate
sysroot" error message in the fallback case, and
use the absolute path of the executable directory
as the sysroot in this case.
(txr_main): Define static area prefixed by @(txr): header. If
a string is present in this data area then process it as an
argument.  Treat the *args* variable carefully.  If we use the
stored string as the argument, save the args in orig_args
variable, then later bind *args* to that. In the -e, -p and
related options processing, we bind *args* to the original
list so args are available to the expression being evaluated.
If the expression mutates *args* then we keep the mutated args
whether or not we are processing the stored string.

* txr.1: Documented in new sction, STAND-ALONE
APPLICATION SUPPORT.

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