Pysica

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* Major changes in the script ccpla
- ion-neutral scattering is now calculated in the center of mass frame of reference
- more data are saved to file during the simulation, including potential distribution and electric current

* Changes in the script ccpla_analysis
- it is now possible to plot other data, such as the potential distribution

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* Major changes in the script ccpla
- electron impact excitation processes have been added to the simulation
- some changes in the GUI have made to correct some erros that did happen when reloading configuration files from the GUI

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First release