Merge pull request #1 from csete/master

merging fork
Merge pull request #2 from csete/master

pull
Merge pull request #3 from csete/master

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updated freq step to 6250Hz
snap-to-freq update
updated AM and NBFM click resolution to 6250Hz
updated device string tooltip with uhd lo_offset option
reverted to master version of mainwindow.cpp
Merge pull request #164 from m0mik/tooltip_update_lo_offset

Updated device string tooltip with uhd lo_offset option.