Added a system test script for the dynamically averaged J-coupling analysis.
This corresponds to the J-test2.py file attached to task #6328 (https://gna.org/task/?6328).
The script is designed for implementing the new code, it contains a few as of yet non-existent user functions.
Authored by: bugman 2008-11-21
Parent: [r8020]
Child: [r8022]