Xpart

**Changes:**
- Introduce generate_2D_pencil_with_absolute_cut
- Extend build_particles to accept a combination of absolute and normalized coordinates

**Changes:**
- Fix inconsistency in version number.

**Changes:**
- Particles.reorganize is now much faster when particles are already sorted

**Full Changelog**: https://github.com/xsuite/xpart/compare/v0.10.1...v0.10.2

**Changes**
- Added method to calculate classical particle radius
- Introduce a more granular test retry facility (`retry` + `with flaky_assertions():`)

**Full Changelog**: https://github.com/xsuite/xpart/compare/v0.10.0...v0.10.1

**Changes:**
- Freeze variables in LocalParticle using precompilation flags

**Changes:**
- Allow apertures between at_element and at_s in xpart.build_particles.