Fix off-by-one error in defining the start and end of an XYEnvironment #1303
  Add this suggestion to a batch that can be applied as a single commit.
  This suggestion is invalid because no changes were made to the code.
  Suggestions cannot be applied while the pull request is closed.
  Suggestions cannot be applied while viewing a subset of changes.
  Only one suggestion per line can be applied in a batch.
  Add this suggestion to a batch that can be applied as a single commit.
  Applying suggestions on deleted lines is not supported.
  You must change the existing code in this line in order to create a valid suggestion.
  Outdated suggestions cannot be applied.
  This suggestion has been applied or marked resolved.
  Suggestions cannot be applied from pending reviews.
  Suggestions cannot be applied on multi-line comments.
  Suggestions cannot be applied while the pull request is queued to merge.
  Suggestion cannot be applied right now. Please check back later.
  
    
  
    
When a new XYEnvironment object is created it is given attributes hight and width which are then used to assign the attributes x_end and y_end. However, the x_end and y_end should be one less than the width as the positional index starts at one.
By fixing this it ensures that the is_inbounds returns the correct value and environments can correctly check if things are inbounds.