Use "--config ui.report_untrusted=false" for hg calls in hgk, fixes
issue523.
tcl's exec yields an error if output to stderr happens and isn't redirected to
a file, so the warnings about untrusted .hg/hgrc caused problems in hgk.
The warning is still printed when executing 'hg view', so the user can see it
when using it from the shell.
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