Johan Bregeon / ctools

This command was run:
  autopep8 --select E101,W191 --in-place --recursive .

It fixes only these two issues:
  - W191 indentation contains tabs
  - E101 indentation contains mixed spaces and tabs

…)-function of individual ctools

The ctbkgcube tool generates a background model for cube-style analysis.

This sets up the system completly. From then on, unit test can be implemented.