added support for WSA5000-408
removed IQIN from the RFE_MODES in 408 units
Merge pull request #133 from mfarhan12/408_support

added support for WSA5000-408
channel power now resets to center of spectrum if mode is changed, or if mode is out of bounds"
fixed changing fstart/fstop edits not showing appropriate values
Merge pull request #134 from mfarhan12/fix-freq-textboxes

Fix freq textboxes
merged with master