FutureWarning: Sort behavior

[e-lo]

• Route.py:474
• Route.py:880
• Stop.py:183
• Stop.py:205
• PathSet.py:374
• Assignment.py:714
• Assignment.py:726

FutureWarning: Sorting because non-concatenation axis is not aligned. A future version
  of pandas will change to not sort by default.
  
  To accept the future behavior, pass 'sort=False'.
  
  To retain the current behavior and silence the warning, pass 'sort=True'.