[misc] Fixed potential code issues
[misc] Added a few more tests
Issue #178: Make the support for measurements more extensible
Sort measurements
Issue #365: New measurement: sitting height
Fixed wrong indication that the measurement is double-sided
Issue #359: New measurement: philtrum length
Issue #365: New measurement: sitting height
Issue #373: New measurement: arm span difference from height
Integrated in the patient sheet.
Issue #178: Make the support for measurements more extensible
Charts are now extensible!
Issue #365: New measurement: sitting height
Fixed broken measurement table