Neqsim

- Huron Vidal parameter oxygen-water updated
- CPA-binary interaction paramter kij updated for N2-water and o2-water
- Peneloux volume correction paramters water, MEG, TEG
- Volume correction parameters for water, MEG and TEG updated (temperature dependent volume correction)
- UMR-PRU model updated with parameters for c-C7 and c-C8, c-C9
- various bug fixes and new features for process calculations (changes for compressors, mixers, etc.)
- Short-cut class for creating new fluids implemented (neqsim.thermo.Fluid class)

- improved stability of TPflash calculations

- verson name changed from 2018.X to 2.X
- improved speed and stability of algorithms (TPflash, phase envelopes)
- added GERG-2008 for calculation of gas density
- various updates in process simulation models (compressors, recycle, mechanical design)