Update analyzer.py, commander.py and one other file

nullptr/models/system.py

@@ -1,6 +1,6 @@
 
 from .base import Base
-
+from math import sqrt
 
 class System(Base):
   x:int = 0
@@ -19,3 +19,6 @@ class System(Base):
   def path(self):
     sector, symbol = self.symbol.split('-')
     return f'atlas/{sector}/{symbol[0:1]}/{self.symbol}.{self.ext()}'
+  
+  def distance(self, other):
+    return sqrt((self.x - other.x) ** 2 + (self.y - other.y) ** 2)