MOTS Finder version 1.4

Main changes in this update include:

• Add several new MOTS properties (several shear properties, invariant angle zeta)
• Add several new MOTT properties (evolution vector, xi vector, surface gravity, extremality parameter, slowness parameter)
• Rewrite MOTT signature computation
• Update documentation and added new tutorials

The notion of "MOTT" properties refers to quantities that cannot be computed from knowledge of a single MOTS. Instead, we need at least an infinitesimal section of the world tube traced out by the MOTSs in time. These properties are hence computed using separate functions which can be called once part of the world tube has been found.

In addition to the above, many smaller changes increase accuracy for certain calculations (e.g. mapping between proper length and numerical parametrisation), speed (e.g. by porting Chebyshev evaluation to C), convenience (e.g. for plotting), and robustness (e.g. atomic saves even over NFS).

Research at Perimeter Institute is supported in part by the Government of Canada through the Department of Innovation, Science and Economic Development Canada and by the Province of Ontario through the Ministry of Colleges and Universities. We also thank the French EIPHI Graduate School (ANR-17-EURE-0002) and the Spanish FIS2017-86497-C2-1 project (with FEDER contribution) for support.