changed whole tree structure of flex_extract to have better overview

README_pythondir.md

documentation/FE_testing.txt

for_developers/COMMANDS

for_developers/ECMWF_FPparameter.xlsx

for_developers/ErrorDebug.ods

for_developers/FE_testing.txt

for_developers/GUIDE.odt

for_developers/SphinxDoc/Makefile

for_developers/SphinxDoc/_build/doctrees/code.doctree

for_developers/SphinxDoc/_build/doctrees/environment.pickle

for_developers/SphinxDoc/_build/doctrees/index.doctree

for_developers/SphinxDoc/_build/html/.buildinfo

for_developers/SphinxDoc/_build/html/_modules/Control.html

for_developers/SphinxDoc/_build/html/_modules/Tools.html

for_developers/SphinxDoc/_build/html/_modules/index.html

for_developers/SphinxDoc/_build/html/_sources/code.rst.txt

for_developers/SphinxDoc/_build/html/_sources/index.rst.txt

for_developers/SphinxDoc/_build/html/_static/ajax-loader.gif

for_developers/SphinxDoc/_build/html/_static/basic.css

for_developers/SphinxDoc/_build/html/_static/classic.css