[DEV] UFEM: DNS particle Coagulation kernel
[DEV] UFEM: Checkpoint particle collision in Burgers vortex
[FIX] UFEM: Gradient IC initialization
[ENH] UFEM: Collsion kernel also works in 2D
[ENH] UFEM: Particle concentration discontinuity capturing
[DEV] UFEM: Discontinuity fixes
[DEV] UFEM: Further discontinuity tweaks
[ENH] UFEM: Initialize Semi-implicit from implicit
[ENH] UFEM: Brownian motion for particles and fix

Attempted fix for NaN when 0 particle concentration
[ENH] UFEM: Combined Brownian and DNS collision kernel
[FIX] UFEM: NaN problems
[FIX] Pressure statistics and output precision
[ENH] Add GenerateLine3D component
[FIX] Missing files
[FIX] Gmsh reader for large files
[MERGE] Merge UFEM particle coagulation work
[FIX] UFEM: Failing tests
[FIX] OS X Boost 1.55 compile errors
[FIX] CGNS coordinate ordering for Fluent
[FIX] UFEM: Comment out proken test.

TODO: investigate why this fails now