Remove precision sweep

[stavros11]

In some calibrations such as resonator and qubit spectroscopy we perform two sweeps, a wide one and a second (precision) centered around the peak found in the first sweep. Personally (and I think @igres26 and @andrea-pasquale agree) I believe that one sweep is sufficient, so I would suggest to remove the precision sweep.

Also, the precision sweep is implemented by copy-pasting the code of the fast sweep, which results to a lot of code and bug duplication.