Fityk 1.2.9

This is a late announcement of long overdue release. It is version 1.2.9 because major features planned for version 1.3.0 (box constraints, new fitting methods) need more testing and better interface.

Changes:

•  fitting:
• a few optimization methods from the NLopt library have been added
• MPFIT and NLopt methods support box constraints
• simplifications that made using external libraries easier:
• removed stopping criterium based on iterations. The max. number of WSSR evaluations can be used instead.
•  removed fit continuation (fit +N)

• new function Sigmoid and new category of functions (S-shaped/step/sigmoidal)
• James Hester contributed a peak shape he proposes for powder diffraction
• GUI: 
• added menu Session > Recent Scripts
• added "include standard errors" checkbox to Functions > Export Peak Parameters
• added "decimal comma" option to Data > Load dialogs.
• and many bug fixes