Pycrires

- New and improved `Pipeline` methods for calibration and 2D spectral extraction
- Updated documentation pages and tutorial

- Implementation and testing of calibration recipes
- Automatic downloading of missing calibration data
- Support for telluric correction with Molecfit
- Updated documentation and tutorial

- Implementation and testing of `Pipeline` methods
- Tutorial added to the documentation

First release of the `pycrires` data reduction pipeline for VLT/CRIRES. The actual pipeline is still under development and not yet included in the release. Instead, this is only a starting point for the pipeline code, documentation, and unit tests.