nick black 0dc5456035
Emit JSON on -J arg to demo #387
Accept -J as a parameter requiring an option to notcurses-demo(1).
Update the man page and usage message to reflect this. Open the
specified file for binary writing with truncation at option parsing
time; fail out if we can't open it. At the end of the demo, write
the results out as JSON, using full precision for all values #387.
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..
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