Simon Bonnefoy / ctools

The Crab test event data are now derived from the Prod2 South_0.5h IRF with an offset angle of 0.5 deg and a simulation radius of 3 deg.

The outcome of the unit tests depends on the presence of the CTOOLS environment variable. If the CTOOLS environment variable is not present the unit test should fail, otherwise it sould succeed.

Note that this breaks compatibility with Python < 2.6.

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