Fixed issue #138 where if an ADIF file is loaded, then a second ADIF
file is added, the QSOs from the first ADIF file are duplicated.
Update version to 1.2.4.
Merge branch 'master' into v1.4

Conflicts:
	hamqsler/Properties/AssemblyInfo.cs
	setup/Setup.wxs
	setup/setup.wixproj
Additional patch needed to merge version 1.2.4 into v1.4.