New version: GasChromatographySystems v0.2.7

[JuliaRegistrator]

• Registering package: GasChromatographySystems
• Repository: https://github.com/GasChromatographyToolbox/GasChromatographySystems.jl
• Created by: @JanLeppert
• Version: v0.2.7
• Commit: 79dc4e64aef30cc3326af9c9649a1c5e1c7ea29b
• Reviewed by: @JanLeppert
• Reference: GasChromatographyToolbox/GasChromatographySystems.jl@79dc4e6#commitcomment-186472548
• Description: A package for the simulation of gas chromatography (GC) in complex systems
• Release notes:

## Compatibility

- Requires GasChromatographySimulator 0.6.x (was ~0.5.6).

## Changes

- Documented ODE solvers in line with GCSim (OwrenZen5, Tsit5, Vern9, etc.).
- Thermal modulator default solver is OwrenZen5() again (was Vern9()).

## Fixes

- graph_to_parameters: inlet/outlet pressure steps are taken from resolved flow-balance pressures (finite values for GCSim 0.6); NaN on internal PressurePoints still marks unknown pressures only in the system graph.
- graph_to_parameters: solutes get t₀ = 0, τ₀ = 0 at load time (not NaN); path simulation still updates them via change_initial on later segments.

## Tests

- Regression checks for finite program pressure steps and zero injection times after graph_to_parameters on a series system with NaN junction pressures.

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