Remove secondary setup.py for cal_tools

cal_tools is installed by the setup.py in the root of the repository, so it doesn't need a separate setup.py script.

cal_tools/setup.py

-from setuptools import setup
-
-setup(
-    name='calTools',
-    version='0.1',
-    packages=['cal_tools',],
-    url='',
-    license='(c) European XFEL GmbH',
-    author='Steffen Hauf',
-    author_email='steffen.hauf@xfel.eu',
-    description=''
-)
-