Improvements to lib_navigation

[scimas]

Issues and improvements pointed out by @nuggreat

• Normalized vectors in calculations where possible to improve accuracy
• Provide a sign for angles to ascending/descending nodes
• Provide the nodal vector itself
• Separate the Isp calculation from burn time calculation in its own function
• Bugs in phase angle calculation
  1. your_ancestors list construction
  2. Ignore the binormal component of target position.
• Use constant:g0 in Isp calculation
• Remove greatCircleHeading or modify it to use the built-in GeoCoordinates:heading