- Implemented Petra's version of the species-specific rescaling scheme
- Improved handling of MODCOL variable
- Updated handling of chord diagnostics
- Modularized EIRENE, TIMEP, TIMER, TSTCHM, SHEATH, SPUTER, COLLIDE, INFCOP, UPCUSR routines
- Subdivided TIMET, UPDLIN, FIND_PARAM, READ_INPUT routines
- Internalized handling of insufficient size of MAXPOIN
- Replaced IOFLUSH C routine with IOFLUSH_USR
- Routine FI, FIVEC, GAUMEH, RSTERN moved in EIRMOD_VELOEL
- Removed obsolete SURAND random number generator and new EIRMOD_H1RNM module
- New EIRMOD_OPENFILE module and MASTER_PATH variable for centralized file opening
- New COUPLE_ALLOC, COUPLE_INIT, COUPLE_POST_INPUT and COUPLE_PARAM routines
- New EIRENE_LOOKUP_ADASDIR_USR routines
- Expanded EIRENE_DEFAULTS_USR routines
- Additional dimension argument to MASYR1 routine
- Additional particle type argument to STEP routine
- Additional reaction type output argument to collision routines
- Changed order of arguments for sampling routines
- Handling of ZI array for bundled cases
- Improved initialization of ionization potentials
- New EXTRAB25_EMISSIVITY routine
- New TIME_TO_SURFACE routine
- Moved EXPINT to src/mathematics
- Corrected TORCOL when advancing ions
- Added default parallelization strategy variables
- Corrected order of variables in fort.13 long write-up
- Corrected usage of MOD_ADDV variable
- Renamed WRITE_CONBE to EIRENE_WRITE_CONBE
- New LOLD31 variable for backward compatibility with SOLPS5.3 formats
- Modified initial seeds choice for time-independent runs
- Removed 0-th element of NPESTA and NPESTR
- New LCPYPRO arrays
- Moved LKIND[IMP] variables to EIRMOD_COMUSR
- Added SMOD_NAME variable to surface model structures
- Added README, EPL and CONTRIBUTING documents
- Added EIRENE_VERSION_STRING output
- Added FLUX_SAVED variable
- Added optional CHECKBIN debugging output
- Made some input variables shared by modules for JSON file handling
- Added handling of very large storage arrays
- Added second broadcast of XMCT after sum over strata
- Moved LCOARSE, LZDEN, MSHFRM, .NMTI, NLPBLS variables to EIRMOD_CCOUPL modules
- Updated .gitignore list
- Output prettifying
- Removed unused VTK output
- Changed some statements and variable declarations to prepare for OpenMP usage
- Replaced statement functions with contained routines
- Code clean-up and additional safeties
- Additional/corrected comments
- Removed trailing whitespaces
- Alignment corrections

Other changes to vectorial momentum tallies:
- Corrected SMOS0 summations and broadcast