Current version is 0.14

* Changes since version 0.13:
  - fixed a keybinding in the plot window
  - fixed various overflows 
  - added some extra nan-checking
  - added support for reading gzipped files
  - added --skip command line option
  - added display of axis ranges on plot background, with '--no-range' option
  - added legend positioning options and '--legend' option

* Changes since Version 0.12:
  - added rudimentary support for exporting images
  - raise control panel using 'p' key
  - some fixes to convergence testing and command line arguments

* Changes since Version 0.11:

  - added some special plots: derivative, subtract A-B, convergence exponent
  - added ability to set axis ranges from the command line and plot window
  - cured various seg-faults
  - introduced various new seg-faults