Added documentation for changes since official release 10.4.

Author: pirmink

CHANGES_since_10.4.md

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+Code changes since 10.4
+=======================
+
+Bugfixes and enhancements in this repository since official release 10.4
+
+Bugfixes
+--------
+
+* options/SPECIES/SPECIES_009: corrected wrong number format, replaced comma by
+  decimal point
+* options/SPECIES/SPECIES_028: corrected wrong number format, moved sign of
+  exponent to after the E
+* options/SPECIES/specoverview.f90: added namelist parameters that appear in
+  SPECIES files but were missing here
+* src/advance.f90: resolution-independent calculation of new longitude if
+  particle crosses pole (i.e. if a particle is advected to below -90 or above 90
+  degree latitude, the calculation of the new longitude was hardcoded for
+  1 degree resolution). Do not put the particle back into domain at all if 
+  it crosses the lower or upper boundary in a limited area simulation.
+* src/caldate.f90: avoid to output hour 240000, change made by Petra for her
+  version 10.4.1
+* src/FLEXPART.f90: replaced compiler-specific command line argument routines
+  by standard Fortran intrinsic routines
+* src/FLEXPART_MPI.f90: ditto
+* src/gridcheck_ecmwf.f90: corrected handling of vertical levels when input
+  file do not contain uppermost layers
+* src/gridcheck_nests.f90: ditto
+* src/makefile: NetCDF output as default option, hint about compiler troubles
+  (relocation error, use -mcmodel=large) caused by -O0, and other changes by
+  Petra for V 10.4.1
+* src/readwind_ecmwf.f90: corrected handling of vertical levels when input file
+  do not contain uppermost layers and corrected conversion_factor for convective
+  precipitation and snow height in GRIB2
+* src/readwind_ecmwf_mpi.f90: ditto
+* src/readwind_nests.f90: ditto
+* src/timemanager.f90: removed non-standard-conformant argument aliasing and
+  corrected kind type declaration
+* src/verttransform.f90: removed superfluous comma (change made independently by
+  both myself and Petra for V 10.4.1)
+* src/readwind_ecmwf_mpi.f90: ditto
+ 
+Code enhancements
+-----------------
+* options/OUTGRID: added comments describing contents
+* options/SPECIES/SPECIES_*: aligned comments 
+* options/SPECIES/specoverview.f90: removed commented lines, rectified lines
+  indenting
+* src/FLEXPART.f90: rectified lines indenting, updated version to 10.4.2 and date
+  in version string
+* src/FLEXPART_MPI.f90: ditto, and realigned code with src/FLEXPART.f90
+* src/gridcheck_*.f90: added code to write out name of file before it is opened
+  (helps a lot for debugging when an input file causes troubles)
+* src/par_mod.f90: added comment explaining relevance of nuvzmax for GRIB input
+* src/readreceptors.f90: Code cosmetics by Petra for V 10.4.1
+* src/readreleases.f90: write out warning if too few particles are used to
+  randomize release
+* src/readspecies.f90: write out name of SPECIES file before it is read
+* src/readwind_*.f90: write out name of input file before opening it
+* src/verttransform_ecmwf.f90: Code enhancements made by Petra for V 10.4.1
+* src/writeheader_txt.f90: removed wrong comment