Resolve "Only write relevant metadata"

Closes #85

See merge request !107

Resolve "Add frequency plan"

Closes #24

See merge request !56

Resolve "Error when using orbit files v2.0"

Closes #82

See merge request !105

Resolve "Change default TTL coupling coefficients to current best estimates"

Closes #84

See merge request !106

Resolve "Add support for orbit files v2.0"

Closes #81

See merge request !103

Resolve "Update README"

Closes #78

See merge request !102

Resolve "Time vectors are saved inconsistently"

Closes #73

See merge request !100

Resolve "Adopt new nomenclature"

Closes #65

See merge request !94