fixed floating point exception on Flexpart

Fix flexpart floating point exception, refactor grib2 loader  (#28)

* add new grib loader, add and wgrib2 lib user to Dockerfile

* fix dlon dlat in OUTGRID file

* fixed test files and refactor helper funcions

Release 0.0.4

• Add a converter that uses a wgri2 lib to change the new file to the old format
• Add a settings.py file that saves all constants and paths to the directories and files

Release 0.0.3

Fixes:

• end date for loading weather data(it will use minutes and seconds)
• save all Flexpart output to the calculations_server.log
• check output messages from Flexpart to have a success row
• removed unused libraries in Dockerfile

Feature:

• enable binary creation in simflex
• provide series id in simflexinp.nml to the simflex to save its binaries and Flexpart nc files

Release 0.0.2

The first release has some problems with downloading grib_data but in general works:

• Setup Fexpart and compile it
• Setup and compile Simflex
• Setup working directory to /calculation/
• Setup series directory to /series/
• Setup input directory to /data/input/
• Grib data files saved in /series/grid_data/ could be changed to the grid_data/

Release 0.0.1

• start a container and mount a folder with input files to the docker container
• start parsing txt and xml files to the /data/calculation folder
• start FLEXPART calculation on each line of the txt file
• start simflex calculation
• copy simflex output files to the /data/output/
• stop container