* Originally by Albin Gersich

When you enter a defended sector, the sequence of events is: 

 1:  Mines detonate.
 2:  Quasar cannons fire at sector level.
 3:  If there are fighters in the sector:
         If offensive, they attack.  If toll, the player may pay
         the toll or attack.  If defensive the player may attack.
         After the toll is paid the quasar cannons fire at sector
         level again.  If the player attacks the fighters, after
         each attack round, even if 0 fighters were used in the
         attack, the quasar cannon fighters sector level.  If the
         player does get all the fighters in one shot and attacks
         five times the quasar will fire all five times.  Continue
         until the toll is paid or there are no fighters in the
         sector.

     When the ship attempts to land:

 4:  If the citadel is level 5 and has at least 1 shield, the
     quasar cannon fires at atmospheric level.
 5:  If the citadel is level 5 and has at least 1 shield, the
     player must destroy the shields to continue.
 6:  If the citadel is level 3 or higher, the quasar cannon fires
     at atmospheric level.
 7:  If the citadel is level 2 or highter, the planetary offensive
     fighters attack.  If the ship has 26214 (hex 6666) or less
     fighters, the number that attack is determined by the military
     reaction level.  If the ship has 26215 or more fighters AND
     the military reaction level is not zero, then ALL planetary
     fighters attack and are lost.
 8:  If the citadel is level 2 or highter, any fighters left on
     the planet defend.  The attacker must destroy them to land.

During a photon wave, only steps 5 and 8 are in effect.  All others
are nullified.  If the photon wave runs out part way through the
sequence, the remaining steps will be in effect.

