Release version 0.7.1

New minor release, adding the following features and fixing the following bugs:

Added

• More documentation / tutorial content.
• Energy conversion functions (keV to m, and viceversa).
• Tapering for truncated volumes in FSC computation.

Fixed

• Typo that preventing using ProjectionGeometry from models.
• Shape dimensions (XYZ vs ZXY) interpretation in VolumeGeometry and other functions.
• Cross-validation data term initialization in solvers.
• Tapering to circular masks.