Avoid using mutable objects (lists) as default arguments.
Merge branch 'python3compat'
Comment spelling and formatting
Correct spelling of DEFAULT_STOPPED_SPEED_THRESHOLD
Remove unused class attributes from GPXRoutePoint which are hidden by instance attributes.
Remove unused class attributes from GPXRoute which are hidden by instance attributes.
Remove unused class attributes from GPXTrackPoint which are hidden by instance attributes.
Remove unused class attributes from GPXTrack which are hidden by instance attributes.
Remove unused class attributes from GPXTrackSegment which are hidden by instance attributes.
Remove unused class attributes from GPX which are hidden by instance attributes.
Remove duplicate assignment to the time attribute in GPX instances.
Fixes spelling of 'extremes' throughout the codebase.
Docstring typo
English grammar in docstring.
Fixes spelling of 'threshold' throughout the codebase.
Removed unused import.
Replaces foo != None with the more idiomatic foo is not None.
Replaces foo = None with the more idiomatic foo is None.
Module docstring should be the first non-comment thing in the module.
Remove redundant parentheses for tuple return.