Flow: Fix the GUI, fix the calibration

[CohenLabPrinceton]

• [ ] Tidal Volumes calculation and display needs to be correct

• [x] LPM not LPS for flow

• [ ] @juliennelachance will follow up with @SophieDvali

• [ ] Revised interface

[sneakers-the-rat]

what does 'revised interface' mean?

[sneakers-the-rat]

displayed units are now correct (L/min rather than l/s) https://github.com/CohenLabPrinceton/Ventilator-Dev/pull/127/commits/55a48cf19c2679f4548f0144dd8e34a08bfeac3b#