/**
\page fsk_keyer FSK Keyer

Open the FSK keyer dialog

<center>
\image latex fskio-keyer/fskio_dialog.png "" width=5.0in
\image html  fskio-keyer/fskio_dialog.png ""
</center>

 with the main dialog menu item "Keyer/FSK keyer".
 
 <center>
\image latex menus/keyer_menu.png "" width = 3.0in
\image html  menus/keyer_menu.png ""
</center>

Config opens:

<center>
\image latex fskio-keyer/fskio_config.png "" width=5.0in
\image html  fskio-keyer/fskio_config.png ""
</center>

The DTR/RTS port can be either
<ul>
<li>shared with the CAT port</li>
<li>shared with the AUX port</li>
<li>shared with the SEP port</li>
<li>shared port with CWIO (if separate)</li>
<li>a unique serial port configured on this dialog</li>
<li>Inverted - enable if interface requires a Mark/Space reversed signal level</li>
<li>select either DTR or RTS for the keyline as required by h/w, 
selection must not conflict with CW keyline</li>
</ul>

PTT delay is in milliseconds.  Enter a non-zero value to enable a delay 
between the PTT-on and the first FSK keyline closure.  The same delay will 
be applied to the last FSK keyline closure and PTT-off.

Control-left-click opens:

<center>
\image latex fskio-keyer/fskio_editor.png "" width=5.0in
\image html  fskio-keyer/fskio_editor.png ""
</center>

An RY macro with start/stop (ptt enable/disable):
<pre>[RYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRY DE W1HKJ K]</pre>

\ref contents "Return to Contents"

*/

