2. "Call 1st" label turns red when armed to respond to a caller.
3. Suppress some recognizable false decodes, send them to cumulative file
"data_dir/false_decodes.txt".
4. Reduce sleep delay in decoder() to 10 ms.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7928 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
