LF: SlowJT9 update (v0.9.14.0)

[Rik Strobbe <rik.strobbe@kuleuven.be>]

Dear all,
 
Beta-release v0.9.14.0 of SlowJT9 has been uploaded, see 
http://www.472khz.org/SlowJT9/.

Changes:
-JT9-10 mode added.
- Waterfall speed will adapt to selected JT9 submode.
- Any (reasonable) value can be entered for tone spacing (allowing flexible 
frequency dividing of the modulated signal).
- Lower frequency limit dropped to 200 Hz (was 400 Hz).
- Option to discard the audio frequency limits added (Settings -> Mode).
  In that case the TX boundaries will be 100 - 4980 Hz regardless of the JT9 
submode.
  The RX boundaries however will still be limited by the resampling process:
  JT9-1: 100 - 4980 Hz
  JT9-2: 100 - 2240 Hz
  JT9-5: 100 - 840 Hz
  JT9-10: 100 - 415 Hz
- Non fatal bug fixed that skipped PTT handling in the first TX cycle after 
'Halt TX' was pressed.

Bug reports, remarks and suggestions are welcome.

73, Rik  ON7YD - OR7T