Proposal

Bugfixes
- Add fallback if `cubic_splines::find_parameter` in `CrossSectionDNDXInterpolant::GetUpperLimit` fails (216)
- Fix wrong sign for energies of continuous losses returned by Secondaries (214)
- Avoid unnecessary evaluations and possible floating point exceptions in Moliere scattering (213)
Documentation and default behaviour
- Add missing documentation for LiquidArgon and the KochMotz parametrization to the config_docu.md (217)
- Change default photopairproduction crosssection for Gammas to KochMotz (215)

This minor releases includes the addition of several new physical models, in addition to some bug fixes.

Physics improvements

- Implement Koch&Motz parametrization for PhotoPairProduction (191)
- Add liquid argon as a new medium (151 / 204)
- Add updated medium properties for Ice and Water; separate medium definitions from different PDG versions into different namespaces (by default, the most recent medium definitions are used) (151 / 204)
- Add sampling methods for the creation of bremsstrahlung photons (189)

Fixes

- Fix numerical issues when propagating high energy muons with low energy cut settings (210)
- Fixes and improvements for the calculation of ionization secondaries (205)
- Fix in BremsElectronScreening parametrization: Use empirical correction factor only for energies below 50 MeV (202)
- Repair bug where Propagation did not stop when a weak interaction occured (190)
- Fix bug in calculation of photonuclear secondaries (207)

- Fix compiler errors on gcc5 (194)
- Improve setup.py: Correct ABI will be used on Linux system when installing PROPOSAL with pip (195)
- Keep initial lepton in Secondaries Calculator for photonuclear interactions (199)

- Fix boost interpolation error (185)
- fix decay if no particle type is given in the particle state (181)
- Avoid unknowingly wrong calculations of momenta in ParticleState (182)
- Update README.md (184)
- fix secondaries calc for photon and add theta calc to public funcions (179)
- Pybind secondaries (178)
- Fix conversion of Vector3D types via consturctors in pybind11 (177)
- add pybindings for the DirectionChangeAngular (173)

- Set fPic if not defined (168). This fixes linker errors when building python bindings using CMake when `CMAKE_POSITION_INDEPENDENT_CODE` is not explicitly set to `TRUE`
- Change condition in Trapezoid3S from < to <= (170). This avoids ARITHMETIC_EXCEPTION errors in some rare cases.

- Set up CI on Windows (162)
- Add missing string header in methods.h (161)
- Update README.md (165, 166)