1. Change to rectangular FFT window for 2D sync spectrum (ss).
2. Move 2D sync spectrum array to common block.
3. Change to quarter-symbol steps for the ss array.
4. Allow up to 4 decoding passes.
5. Wire up Fast/Normal/Deep for 2, 3, or 4 decoding passes.
6. Make minsmo=0 (instead of 1) for minimally spread JT65B/C signals.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@8178 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
displayed DT values appear to be to low by 0.2 s -- they range from
-2.2 s to +4.8 s, according to files generated by jt65sim.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6179 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
