made 2s3r case more compact. a total of 4 time steps are used, with the preference change coming right after the time step in which the 3rd reactor comes online
Merge pull request #167 from gidden/physor-density

made 2s3r case more compact. a total of 4 time steps are used, with the ...
sed updated to new eventmanager, and timelistener interfaces
renamed vars accordingly
Create directory for input files and move input files.
Remove simple system_call.py
Add physor input files
Add python file with a list of simulation files.
Add tools.py from scopatz/xdress
Add cyclus_tools.py with a function to call cyclus
Correct zip() error in run_cyclus function
Add script to create reference output databases
Add a check if the target output directories exist
Renamed the file with input and reference output file names
Renamed the file with input and reference output file names
Correct import statement after renaming test_lists.py to testcases
Correct a bug in creating directories as needed for output.
Merge branch 'cyclus_tools' into regression_test
Stylistic errors are corrected
Merge pull request #170 from rakhimov/regression_test

Introduction of a capability to create reference databases