PyCorrFit 0.9.3

• Fitting: migrate to lmfit
  • This introduces a new dependency for building PyCorrFit.
    (e.g. in Debian, the package "python-lmfit" is required)
  • Improved fitting behavior at parameter boundaries
  • Removed "Polak-Ribiere" fitting algorithm
  • Added "Sequential Linear Squares Programming" algorithm
• Heuristic fit (#109):
  • Detect parameters that are stuck during fitting
  • Fit each curve five times or less and check
    whether the fit converges.
  • If two diffusion time parameter exist in a model, always
    make sure that one parameter is the larger one. This
    feature can currently not be disabled (#110).
• Allow infinity ("inf" and "-inf") parameters for models
  and boundaries.
• New model: confocal T+T+3D+3D
• Bugfixes:
  • Sessions saved with 64bit Windows were not opened (#136)
  • Old sessions and "KeyError: 'chi2'"
  • Old session file extension was not recognized (#106)