Move "Wish List Searches" and "Received Searches" into own tabs in main tab bar

I think it would be more intuitive to have "Wish List Searches" and "Received Searches" as their own independent tabs in the Main tab-bar - instead of as a subwindow of the "Search" tab. This not only allows more screen real-estate for searches (the most often used window of the entire program) - but it also makes sense since me trying to find a song is a completely different task-flow and thought-activity to be done at a different time to me wanting to see what other searches my client has received.