chore(version): Single version sourcing

* Use a _version.py file to hold the version. Created by Makefile.

FofbTool/__init__.py

@@ -14,4 +14,4 @@ This package is cut in several modules:
 For basic usage, see doc of FofbTool.Utils
 
 """
-__version__ = "2.2"
+from FofbTool._version import version as __version__

Makefile

+
+
+VERSION:
+	echo version=\'$(shell git describe --tags | sed 's/\(.*\)-.*/\1/')\' > FofbTool/_version.py
+
+
+clean:
+	rm -f FofbTool/_version.py

setup.py

 #!/usr/bin/env python
 
 from distutils.core import setup
+from FofbTool._version import version
 
 setup(name='FofbTool',
-      version='2.2',
+      version=version,
       description='Python module to operate and configure SOLEIL FOFB.',
       url='https://gitlab.synchrotron-soleil.fr/dg/fofb/fofbtool',
       license="GNU-GPL-v3",