fix spelling error
ASCII tables

  * Added ASCII3 table
    - ASCII - used for RTTY
    - ASCII2 - used for ARQ / PSKMAIL
    - ASCII3 - used for all other text
Extract timeout

  * Removed 16384 size limitation on WRAP file extract processing.
  * Added 10 second timeout.  Extract process reset after a 10 second
    period of no incoming text.
Socket send on Linux

  * Modified socket send routine to test for kernel send socket failure
Combo update

  * Updated combo box widget class
UI enhancements

  * Added configure item in UI general to open confirmation
    dialog when user exits program
  * Fix RPC log TimeOn value,
    without this, timeon == timeoff.
    patch corrects data transfer to CQRlog.
  * Add new shortcuts in TX widget.
    - SC-c for <CALL>
    - SC-n for <NAME>
    - SC-r for <RST>
    - SC-l for <MYLOC>
    - SC-h for <MYQTH>
    - SC-a for <ANTENNA>
    - SC means Shift-Control.
Backspaces patch

  * Correct failure to send Tx text when first character entered
    is a backspace.
WRAP binary files

  * Add character handling in Rx for both received and transmit echo
    characters when sending binary data.
DominoEX varicode

  * Correct table entries for { }
    - values incorrect in original gmfsk implementation
flmsg/flamp stream processing

  * added parsing of cmd line parameters when opening flmsg
    upon completion of wrap file extraction
  * added parsing of flamp text streams
  * modified socket arq to separate socket i/o from both
    signal processing and main thread.
Version 3.21.51

  Maintenance release
ASCII table correction

  * corrected initialization of ASCII3 table
Version 3.21.52

  * Maintenance release
    - correction to ASCII tables.
    - fixes possible seg fault
Hamlib sideband menu

  * Toggle initialize button when sideband menu selector changes
UTF-8 char echo

  - fix echoing of UTF-8 characters in the Rx panel
Log file update

  * Write UTF-8 to log file
  * Remove redundant code
    - open log file in main.cxx
    - also in function create_fl_digi_main_primary()
Logbook Call width

  * Base Freq / Call control width on width of string
    "WW/WW8WWW/WW." vice
    "99.99999"99
  * needed for OS X - default fonts use very narrow digits
Fix crash if no OSS mixer support

Protect MixerOSS:: routines from trying to access uninitialized tables, as
happens when no OSS mixer support is present.  Specifically, if openMixer()
or initMask() error out for whatever reason, then InputSourceNbr() and other
routines will crash becasue num_rec and num_out never get set to zero.

BugLink: https://bugs.launchpad.net/ubuntu/+source/fldigi/+bug/1058298
Version 3.21.53

  - Maintenance release
Add_tx_char

  * Fix calling add_tx_char() from a wrong thread