0.4.0

- Created new separate file format for data related to multi-fish
  tracking

0.3.3

- Interface addition: Scale of ruler now displayed at endpoints
- Fixed issue with calculating time delta for fish Speed, causing 
  nan/inf to occasionally appear for intervals of analyzed data

0.3.2

- Added checkbox to data analysis window to toggle using ALL 
  tracking values in intervals.  When unchecked, only those frames 
  where confidence is above the threshold are used in the analysis 
  (this is the behaviour in previous versions)

0.3.1

- Fixed bug in calculating shoaling value for Data Analysis window

0.3.0

- Added a new Data Analysis to interactively choose variables 
  and intervals to calculate mean and variance over
- Added multi-fish tracking (# Fish to Track option)
- Added point distance measuring tool

0.2.2

- Initial public release