Update UniversalFlash.vb

Updated  PV flash to a high level only flash, considering all possible cases of liquid phase split and occurence of solids.

some solid flash issues + hx issues fixed

Merge pull request DanWBR#60 from DanWBR/andr1976-pseudo

Changing C7+ Petroleum characterisation to handle a single component.…

bug fix PR/SRK isothermal compressibility

v6.3 Update 4

v6.3 Update 3

fixed update checks

v6.2 Update 3

dtl fix

Mono/Linux bug fixes; enhanced realiability of gibbs reactor solver (…

…added an option to initialize from previous solution); fixed Sensitivity Analysis utility not displaying variables (CPUI)