Domenico Tiziani / ctools

…rk for absolute imports that are used as standard in Python 3. Also always exist with sys.exit() so that errors are correctly catched by Jenkins.

… ctcubemask for this purpose

This avoids code duplication and makes use to the standard unit tests within the installation.

This initial version tests the spectral power law model.

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

Conflicts:
	scripts/csresmap.py

…lso modified consistently, csresmap can now also take two maps (cnt and model) as input and compute the residuals directly. The algorithm parameter has been made unhidden