Fix rate setting for devices with <4Msps rates (RTL).
Fix GUI rate picking logic for <4Msps devices (RTL)
Live sample rate changing for RTL devices in modes_gui
Fix issue with stop/restart in modes_gui.
Spruce up the Javascript map handler so it doesn't just wipe the map
and repopulate. No "flashing icons".
Merge remote-tracking branch 'upstream/master'