Various minor tweaks and bugfixes.

- Added a fifty-year option for supernovae.
- Tweaked several solar system initializers.
- Improved nebulae in post-supernova systems.
- Supernova remnants (black holes, neutron stars, and pulsars) will now properly manifest their modifiers.
- Various other minor improvements.

- Improved the appearance of post-supernova gas giants.
- Copied over the First Colony event and Evacuation Protocol edict from the Doomsday origin.
- Tweaked spawn rate for primitives in supernova systems.
- Machine/Atomic/Early Space Age primitives in supernova systems will no longer advance to proper space-faring empires.

- Added an anomaly to the nova habitat.
- Other planets in the nova system will not have anomalies anymore.
- Fixed the nebula system modifiers stacking.

- Improved Nebulae mechanics for supernova systems.
- Adjusted which star types could spawn supernovae.
- The Recurring Nova system is back! Now with an abandoned habitat circling one of its gas giants...

Supernovae now leave behind a turbulent nebula after going kaboom.

Updated to 2.7.

Minor bugfixes.

Updated to 2.6.

- You can now start in a binary or trinary supernova system.
- Added a proper model for Class K Orange Giants.