LimeSDR and XTRX changes
- LimeSDR: revised labels and tooltips for antenna select. Fixes issue #506
- LimeSDR: GUI: flip SR and Hw/Sw decimation or interpolation displays
- XTRX: GUI: flip SR and Hw/Sw decimation or interpolation displays
- XTRX: REST API: fixed wrong setting object
- XTRX: fixed sample rate setting
- XTRX: reduce block size to 4096 bytes