PyCorrFit 0.8.8-beta2

• Improved support for "ALV-7004" files (#104)
• Increase resolution for image export
• Load weights from PyCorrFit csv files
• Tool 'Overlay Curves': show cropped correlation curves
• Tool 'Trace view': increase size of window (#93)
• Tool 'Global fitting': remove forced, joint weights
• Bugfixes:
  • fitting algorithms did not work (#94)
  • creating averages did not work (#123)
  • ascii errors in statistics tool (#112)
• Under the hood:
  • Introduce new classes: Correlation, Fit, Trace
  • Code cleanup and rewrite to support planned features
  • In some cases support older versions of NumPy