Instrument/MeasurementType: Allow for converting to the same type

When trying to convert measurments to a standarised type some inputs
may already be of the correct type and will now return the same value
unchanged.
1 file changed
tree: 53e84efe13e4acd0d141b6b915bfa05216390346
  1. devlib/
  2. doc/
  3. src/
  4. .gitignore
  5. README.rst
  6. setup.py