v0.2.0: Temperature controlled lasers, user level control and access any laser setting conveniently

- Added support for temperature tuned lasers, automatic discovery of whether 
  the laser is wavelength or temperature controlled
- Adding a `client` attribute to the `DLCcontrol` class to access any laser
  attribute
- Methods for setting and getting the user level for enabling change of
  restricted parameters
- Parameters dictionary now includes timestamp of the parameter set
- Black formatting