This is a changelog for the dev branch of FLEXPART (see flexpart.eu)
Created by Petra Seibert, 8 June 2018 to document and explain in detail why I changed what.

makefile, 2018-06-08
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1) Add a GPL3+ License statement, author statement, version information. Prudent to do that, not harmful.

2) There are already two sections, one for gfortran4 and one for gfortran5.
Both have NILU-specific paths. So let us have at least one generic and put that in front.

2) Compiler options. 
2.1) For the regular compile, we don't want -g (debug symols)
2.2) We don't need -m64, on a 64bit platform this is default
2.3) Remove $(USER) as it is never defined
2.4) Remove -Warray-bounds, this is default.
2.5) Add -fbacktrace in the commented-out part, it is important for debugging
2.6) Change comment for VPATH, explain what this directive does
2.7) Added some explanation of options as comment.  Maybe expand later.

Notes and questions:
1. Would be nice to have a debug version also for serial code.
2. Would be nice to have "as fast as possible" option (thought it might be machine-dependent ...)
3. What is the purpose of -Warray-bounds ? Is it relevant for Fortran? I think if there is a compile-time array-bound violation this would be a hard error?

FLEXPART.f90
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Update version string!

readcommand.f90
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Correct misleading error message (replace "open" by "write to")
Improve error messages: combine pathname+filename, remove unaligned closing ###
Let STOP say in which subroutine we are stopping
Some minor changes