for CQWW Contest, user can now enter '5NN A4' in the sent exchange. (previously 'A4' was reported as an error)
calling stations will apply cut-numbers to CQ-Zone about 70% of the time
insert occasional leading zero (5% of the time)
RST column is left justified
Resolves Issue #331
Internal
use TStation.Exch2 instead of TStation.NR to hold CQ-Zone. Allows ability to store user-entered sent exchange with cut numbers. Moves the code one step closer to using Exch2 exclusively.
Internal